LEGO 9785-1 Robo Technology Set (Serial Cable) ↗
RCX · 9785-1

LEGO 9785-1 Robo Technology Set (Serial Cable)

2003 221 pieces Retired
New / sealed value$336.60124.4% above original retail
Original retail$149.99Launch price
Used value$279.38Current estimate
90-day trendN/A123 months recorded
PRICE GUIDE

Current LEGO 9785-1 values

Condition-specific market estimates compared with the original retail price.

New / sealed value $336.60 +124.4% vs. retail
Used value $279.38 $263.00 – $298.39
Original retail $149.99 Launch price
Market values are estimates for the set condition shown; live retailer and marketplace prices may differ.
MARKET TREND

Price history

Source-reported monthly market closes through Aug 2026; these can differ from the current estimated market value.

Monthly close$340.58123 plotted months
Used value$279.38Current estimate
Used range$263.00 – $298.39Current low to high
Latest monthly close$340.58
Period low$236.75
Period high$393.36
Period change+19.6%
MARKET VALUE Sealed price history
Latest $340.58 +19.6% over period
Monthly market value history Closing market value from Jun 2016 to Aug 2026. $417 $349 $281 $213 Jun 2016: $284.72 Jul 2016: $265.00 Aug 2016: $270.49 Sep 2016: $250.88 Oct 2016: $271.90 Nov 2016: $285.97 Dec 2016: $308.13 Jan 2017: $269.15 Feb 2017: $274.73 Mar 2017: $254.73 Apr 2017: $269.97 May 2017: $269.22 Jun 2017: $280.21 Jul 2017: $259.98 Aug 2017: $281.62 Sep 2017: $271.98 Oct 2017: $266.55 Nov 2017: $294.78 Dec 2017: $317.60 Jan 2018: $263.93 Feb 2018: $285.90 Mar 2018: $276.03 Apr 2018: $270.53 May 2018: $277.39 Jun 2018: $288.68 Jul 2018: $267.82 Aug 2018: $236.75 Sep 2018: $282.89 Oct 2018: $288.69 Nov 2018: $303.59 Dec 2018: $327.06 Jan 2019: $285.64 Feb 2019: $280.08 Mar 2019: $286.98 Apr 2019: $292.87 May 2019: $271.56 Jun 2019: $294.27 Jul 2019: $289.73 Aug 2019: $284.08 Sep 2019: $291.13 Oct 2019: $297.08 Nov 2019: $312.39 Dec 2019: $336.53 Jan 2020: $293.89 Feb 2020: $288.15 Mar 2020: $295.24 Apr 2020: $301.29 May 2020: $291.72 Jun 2020: $287.85 Jul 2020: $295.11 Aug 2020: $307.08 Sep 2020: $315.48 Oct 2020: $293.52 Nov 2020: $321.22 Dec 2020: $333.92 Jan 2021: $299.22 Feb 2021: $293.21 Mar 2021: $300.54 Apr 2021: $331.19 May 2021: $304.87 Jun 2021: $298.89 Jul 2021: $306.25 Aug 2021: $321.02 Sep 2021: $304.66 Oct 2021: $298.51 Nov 2021: $302.83 Dec 2021: $355.48 Jan 2022: $310.40 Feb 2022: $304.30 Mar 2022: $311.74 Apr 2022: $318.08 May 2022: $294.87 Jun 2022: $319.48 Jul 2022: $314.49 Aug 2022: $308.30 Sep 2022: $315.89 Oct 2022: $322.29 Nov 2022: $338.83 Dec 2022: $364.94 Jan 2023: $318.65 Feb 2023: $312.37 Mar 2023: $319.98 Apr 2023: $326.47 May 2023: $302.64 Jun 2023: $327.88 Jul 2023: $322.74 Aug 2023: $316.37 Sep 2023: $324.14 Oct 2023: $330.68 Nov 2023: $347.64 Dec 2023: $374.41 Jan 2024: $326.89 Feb 2024: $320.43 Mar 2024: $328.25 Apr 2024: $334.89 May 2024: $310.43 Jun 2024: $336.29 Jul 2024: $331.01 Aug 2024: $324.45 Sep 2024: $332.41 Oct 2024: $339.10 Nov 2024: $356.47 Dec 2024: $383.90 Jan 2025: $335.16 Feb 2025: $328.52 Mar 2025: $336.50 Apr 2025: $343.28 May 2025: $318.19 Jun 2025: $344.69 Jul 2025: $339.25 Aug 2025: $332.52 Sep 2025: $340.65 Oct 2025: $347.49 Nov 2025: $365.27 Dec 2025: $393.36 Jan 2026: $343.41 Feb 2026: $336.58 Mar 2026: $344.74 Apr 2026: $351.68 May 2026: $325.96 Jun 2026: $353.08 Jul 2026: $347.50 Aug 2026: $340.58 Jun 2016Jul 2021Aug 2026
View monthly price data
MonthOpenLowHighCloseSalesSource
2026-08 $294.14 $278.66 $371.55 $340.58 N/A Market data provider
2026-07 $313.40 $302.03 $370.23 $347.50 N/A Market data provider
2026-06 $304.93 $288.88 $385.18 $353.08 N/A Market data provider
2026-05 $293.97 $283.31 $347.28 $325.96 N/A Market data provider
2026-04 $303.72 $287.74 $383.65 $351.68 N/A Market data provider
2026-03 $310.91 $299.63 $367.29 $344.74 N/A Market data provider
2026-02 $290.69 $275.39 $367.18 $336.58 N/A Market data provider
2026-01 $309.71 $298.48 $365.87 $343.41 N/A Market data provider
2025-12 $339.72 $321.84 $429.12 $393.36 N/A Market data provider
2025-11 $329.43 $317.48 $389.17 $365.27 N/A Market data provider
2025-10 $300.11 $284.31 $379.08 $347.49 N/A Market data provider
2025-09 $307.22 $296.08 $362.94 $340.65 N/A Market data provider
2025-08 $287.17 $272.06 $362.75 $332.52 N/A Market data provider
2025-07 $305.96 $294.86 $361.45 $339.25 N/A Market data provider
2025-06 $297.68 $282.02 $376.02 $344.69 N/A Market data provider
2025-05 $286.97 $276.56 $339.01 $318.19 N/A Market data provider
2025-04 $296.47 $280.87 $374.49 $343.28 N/A Market data provider
2025-03 $303.47 $292.47 $358.51 $336.50 N/A Market data provider
2025-02 $283.72 $268.79 $358.38 $328.52 N/A Market data provider
2025-01 $302.27 $291.31 $357.09 $335.16 N/A Market data provider
2024-12 $331.55 $314.10 $418.80 $383.90 N/A Market data provider
2024-11 $321.49 $309.83 $379.79 $356.47 N/A Market data provider
2024-10 $292.86 $277.44 $369.93 $339.10 N/A Market data provider
2024-09 $299.79 $288.91 $354.15 $332.41 N/A Market data provider
2024-08 $280.21 $265.46 $353.95 $324.45 N/A Market data provider
2024-07 $298.52 $287.70 $352.66 $331.01 N/A Market data provider
2024-06 $290.43 $275.15 $366.86 $336.29 N/A Market data provider
2024-05 $279.96 $269.81 $330.73 $310.43 N/A Market data provider
2024-04 $289.22 $274.00 $365.33 $334.89 N/A Market data provider
2024-03 $296.04 $285.30 $349.72 $328.25 N/A Market data provider
2024-02 $276.74 $262.17 $349.56 $320.43 N/A Market data provider
2024-01 $294.82 $284.12 $348.28 $326.89 N/A Market data provider
2023-12 $323.35 $306.33 $408.45 $374.41 N/A Market data provider
2023-11 $313.52 $302.15 $370.38 $347.64 N/A Market data provider
2023-10 $285.59 $270.56 $360.74 $330.68 N/A Market data provider
2023-09 $292.33 $281.73 $345.34 $324.14 N/A Market data provider
2023-08 $273.22 $258.84 $345.13 $316.37 N/A Market data provider
2023-07 $291.07 $280.51 $343.85 $322.74 N/A Market data provider
2023-06 $283.16 $268.26 $357.68 $327.88 N/A Market data provider
2023-05 $272.94 $263.04 $322.44 $302.64 N/A Market data provider
2023-04 $281.95 $267.11 $356.15 $326.47 N/A Market data provider
2023-03 $288.58 $278.11 $340.92 $319.98 N/A Market data provider
2023-02 $269.77 $255.57 $340.76 $312.37 N/A Market data provider
2023-01 $287.38 $276.96 $339.50 $318.65 N/A Market data provider
2022-12 $315.18 $298.59 $398.12 $364.94 N/A Market data provider
2022-11 $305.58 $294.50 $361.00 $338.83 N/A Market data provider
2022-10 $278.34 $263.69 $351.59 $322.29 N/A Market data provider
2022-09 $284.89 $274.56 $336.56 $315.89 N/A Market data provider
2022-08 $266.26 $252.25 $336.33 $308.30 N/A Market data provider
2022-07 $283.63 $273.34 $335.07 $314.49 N/A Market data provider
2022-06 $275.92 $261.39 $348.52 $319.48 N/A Market data provider
2022-05 $265.94 $256.29 $314.17 $294.87 N/A Market data provider
2022-04 $274.70 $260.25 $346.99 $318.08 N/A Market data provider
2022-03 $281.15 $270.95 $332.13 $311.74 N/A Market data provider
2022-02 $262.81 $248.97 $331.96 $304.30 N/A Market data provider
2022-01 $279.94 $269.79 $330.71 $310.40 N/A Market data provider
2021-12 $307.01 $290.85 $387.80 $355.48 N/A Market data provider
2021-11 $273.11 $263.21 $322.64 $302.83 N/A Market data provider
2021-10 $257.80 $244.23 $325.64 $298.51 N/A Market data provider
2021-09 $274.76 $264.80 $324.59 $304.66 N/A Market data provider
2021-08 $277.25 $262.66 $350.21 $321.02 N/A Market data provider
2021-07 $276.19 $266.18 $326.28 $306.25 N/A Market data provider
2021-06 $258.13 $244.54 $326.06 $298.89 N/A Market data provider
2021-05 $274.95 $264.98 $324.81 $304.87 N/A Market data provider
2021-04 $286.03 $270.97 $361.30 $331.19 N/A Market data provider
2021-03 $271.05 $261.22 $320.21 $300.54 N/A Market data provider
2021-02 $253.23 $239.90 $319.87 $293.21 N/A Market data provider
2021-01 $269.86 $260.07 $318.80 $299.22 N/A Market data provider
2020-12 $288.38 $273.20 $364.27 $333.92 N/A Market data provider
2020-11 $289.70 $279.19 $342.24 $321.22 N/A Market data provider
2020-10 $253.49 $240.15 $320.20 $293.52 N/A Market data provider
2020-09 $284.52 $274.20 $336.12 $315.48 N/A Market data provider
2020-08 $265.20 $251.24 $334.99 $307.08 N/A Market data provider
2020-07 $266.15 $256.50 $314.41 $295.11 N/A Market data provider
2020-06 $248.60 $235.52 $314.02 $287.85 N/A Market data provider
2020-05 $263.10 $253.56 $310.81 $291.72 N/A Market data provider
2020-04 $260.20 $246.51 $328.68 $301.29 N/A Market data provider
2020-03 $266.27 $256.61 $314.56 $295.24 N/A Market data provider
2020-02 $248.86 $235.76 $314.34 $288.15 N/A Market data provider
2020-01 $265.05 $255.44 $313.12 $293.89 N/A Market data provider
2019-12 $290.64 $275.34 $367.12 $336.53 N/A Market data provider
2019-11 $281.74 $271.52 $332.83 $312.39 N/A Market data provider
2019-10 $256.57 $243.07 $324.09 $297.08 N/A Market data provider
2019-09 $262.56 $253.04 $310.18 $291.13 N/A Market data provider
2019-08 $245.34 $232.43 $309.91 $284.08 N/A Market data provider
2019-07 $261.30 $251.82 $308.69 $289.73 N/A Market data provider
2019-06 $254.15 $240.77 $321.03 $294.27 N/A Market data provider
2019-05 $244.91 $236.03 $289.32 $271.56 N/A Market data provider
2019-04 $252.93 $239.62 $319.50 $292.87 N/A Market data provider
2019-03 $258.82 $249.43 $305.75 $286.98 N/A Market data provider
2019-02 $241.89 $229.16 $305.54 $280.08 N/A Market data provider
2019-01 $257.61 $248.27 $304.33 $285.64 N/A Market data provider
2018-12 $282.46 $267.60 $356.79 $327.06 N/A Market data provider
2018-11 $273.79 $263.86 $323.45 $303.59 N/A Market data provider
2018-10 $249.32 $236.20 $314.93 $288.69 N/A Market data provider
2018-09 $255.13 $245.87 $301.39 $282.89 N/A Market data provider
2018-08 $204.47 $193.71 $258.28 $236.75 N/A Market data provider
2018-07 $241.54 $232.78 $285.34 $267.82 N/A Market data provider
2018-06 $249.32 $236.19 $314.93 $288.68 N/A Market data provider
2018-05 $250.17 $241.10 $295.54 $277.39 N/A Market data provider
2018-04 $233.64 $221.34 $295.13 $270.53 N/A Market data provider
2018-03 $248.94 $239.91 $294.08 $276.03 N/A Market data provider
2018-02 $246.91 $233.91 $311.89 $285.90 N/A Market data provider
2018-01 $238.03 $229.40 $281.20 $263.93 N/A Market data provider
2017-12 $274.29 $259.85 $346.47 $317.60 N/A Market data provider
2017-11 $265.85 $256.21 $314.06 $294.78 N/A Market data provider
2017-10 $230.20 $218.09 $290.78 $266.55 N/A Market data provider
2017-09 $245.29 $236.39 $289.77 $271.98 N/A Market data provider
2017-08 $243.22 $230.42 $307.22 $281.62 N/A Market data provider
2017-07 $234.47 $225.96 $276.99 $259.98 N/A Market data provider
2017-06 $242.00 $229.26 $305.68 $280.21 N/A Market data provider
2017-05 $242.81 $234.00 $286.84 $269.22 N/A Market data provider
2017-04 $233.16 $220.89 $294.52 $269.97 N/A Market data provider
2017-03 $229.73 $221.40 $271.39 $254.73 N/A Market data provider
2017-02 $237.26 $224.78 $299.70 $274.73 N/A Market data provider
2017-01 $242.74 $233.94 $286.76 $269.15 N/A Market data provider
2016-12 $266.11 $252.11 $336.14 $308.13 N/A Market data provider
2016-11 $257.91 $248.56 $304.68 $285.97 N/A Market data provider
2016-10 $234.82 $222.46 $296.61 $271.90 N/A Market data provider
2016-09 $226.26 $218.05 $267.29 $250.88 N/A Market data provider
2016-08 $233.61 $221.31 $295.08 $270.49 N/A Market data provider
2016-07 $238.99 $230.32 $282.33 $265.00 N/A Market data provider
2016-06 $245.89 $232.95 $310.60 $284.72 N/A Market data provider
VALUE OUTLOOK

Growth and retirement

Total growthN/ACurrent sealed value vs MSRP
Annual growthN/A12-month close change
1-year forecast$348.65+3.6%
5-year forecast$396.27+17.7%
5-year range$377.00 – $409.00Collected estimate
Used value range$263.00 – $298.39Observed market range
MethodSource-provided projectionDisplayed as collected; BrickPriceWatch does not recalculate it.
Forecast sourceMarket data providerSource attached to the forecast fields.
Recorded history123 monthsCurrent history coverage on BrickPriceWatch.
ConfidenceNot independently scoredA range appears only when the source supplies bounds.

Forecasts are directional estimates, not guaranteed future prices or investment advice. Actual value depends on condition, demand, fees, and sale timing.

Released through the Education line and now retired, the Robo Technology Set with Serial Transmitter is an early Mindstorms-era kit whose included RCX brick, motors, sensors and serial transmitter drive nostalgia and condition-sensitive demand, and long retirement plus education-channel distribution increase scarcity while aging electronics add volatility.

SET PRICE GUIDE

LEGO 9785-1 Robo Technology Set (Serial Cable) price, value and history

LEGO 9785-1 Robo Technology Set (Serial Cable) is a set released in 2003 in the RCX theme with 221 pieces. This BrickPriceWatch price guide combines a current new and sealed value of $336.60, an original retail price of $149.99, and 123 months of source-reported price history in USD.

The current comparison is based on collected market observations rather than a guaranteed selling price. The recorded used value is $279.38. The set is recorded as retired.

Current market dataa current new and sealed value of $336.60
Retail comparisonan original retail price of $149.99
Retailer availabilityno recent verified retailer quote; open the offer panel for the latest observed links.

How to use this LEGO price guide

Use the price guide to compare new and sealed value with the original retail price, inspect monthly high, low, and closing prices, and review current retailer offers before buying. Set condition, completeness, packaging, shipping, taxes, and marketplace timing can change the final price.

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