Mindstorms · 51515-1
LEGO 51515-1 Robot Inventor
New / sealed value$749.99108.3% above original retail
Original retail$359.99Launch price
Used value$384.70Current estimate
90-day trendN/A70 months recorded
PRICE GUIDE
Current LEGO 51515-1 values
Condition-specific market estimates compared with the original retail price.
New / sealed value
$749.99
+108.3% vs. retail
Used value
$384.70
$375.58 – $461.64
Original retail
$359.99
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$888.3424 plotted months
Used value$384.70Current estimate
Used range$375.58 – $461.64Current low to high
Latest monthly close$888.34
Period low$661.00
Period high$929.87
Period change+34.4%
MARKET VALUE
Sealed price history
Latest
$888.34
+34.4% over period
View monthly price data
| Month | Open | Low | High | Close | Sales | Source |
|---|---|---|---|---|---|---|
| 2026-08 | $767.20 | $726.82 | $969.09 | $888.34 | 17 | Market data provider |
| 2026-07 | $659.61 | $635.69 | $779.23 | $731.39 | 17 | Market data provider |
| 2026-06 | $787.72 | $746.26 | $995.01 | $912.09 | 17 | Market data provider |
| 2026-05 | $838.62 | $808.20 | $990.70 | $929.87 | 9 | Market data provider |
| 2026-04 | $748.33 | $708.95 | $945.26 | $866.49 | 15 | Market data provider |
| 2026-03 | $743.06 | $716.11 | $877.81 | $823.91 | 19 | Market data provider |
| 2026-02 | $705.33 | $668.21 | $890.95 | $816.70 | 22 | Market data provider |
| 2026-01 | $693.34 | $668.19 | $819.07 | $768.78 | 19 | Market data provider |
| 2025-12 | $690.57 | $654.23 | $872.30 | $799.61 | 31 | Market data provider |
| 2025-11 | $775.32 | $747.20 | $915.92 | $859.68 | 34 | Market data provider |
| 2025-10 | $755.32 | $715.57 | $954.09 | $874.58 | 36 | Market data provider |
| 2025-09 | $652.27 | $628.61 | $770.56 | $723.24 | 20 | Market data provider |
| 2025-08 | $686.97 | $650.81 | $867.75 | $795.44 | 22 | Market data provider |
| 2025-07 | $711.36 | $685.56 | $840.36 | $788.76 | 10 | Market data provider |
| 2025-06 | $676.43 | $640.83 | $854.44 | $783.23 | 27 | Market data provider |
| 2025-05 | $677.55 | $652.97 | $800.42 | $751.27 | 19 | Market data provider |
| 2025-04 | $665.88 | $630.83 | $841.11 | $771.01 | 20 | Market data provider |
| 2025-03 | $616.38 | $594.03 | $728.16 | $683.45 | 22 | Market data provider |
| 2025-02 | $588.99 | $557.99 | $743.99 | $681.99 | 19 | Market data provider |
| 2025-01 | $621.88 | $599.33 | $734.66 | $689.55 | 22 | Market data provider |
| 2024-12 | $575.14 | $544.87 | $726.49 | $665.95 | 20 | Market data provider |
| 2024-11 | $616.35 | $594.00 | $728.12 | $683.41 | 24 | Market data provider |
| 2024-10 | $644.77 | $610.84 | $814.45 | $746.58 | 15 | Market data provider |
| 2024-09 | $596.13 | $574.51 | $704.24 | $661.00 | 22 | Market data provider |
EXTERNAL ESTIMATE
Independent Market Value Trend
Source-reported new/sealed market estimates, aggregated monthly and displayed in USD.
Latest estimate$616.55
Period low$538.75
Period high$684.97
Period change+0.1%
MARKET VALUE
Independent new/sealed market value
Latest
$616.55
+0.1% over period
View independent market value data
| Month | Open | Low | High | Close | Source |
|---|---|---|---|---|---|
| 2026-08 | $611.76 | $611.76 | $619.15 | $616.55 | Secondary-market data provider |
| 2026-07 | $669.62 | $601.91 | $700.26 | $611.54 | Secondary-market data provider |
| 2026-06 | $685.09 | $667.09 | $685.26 | $670.26 | Secondary-market data provider |
| 2026-05 | $651.49 | $651.18 | $692.38 | $684.97 | Secondary-market data provider |
| 2026-04 | $645.16 | $642.37 | $658.61 | $653.46 | Secondary-market data provider |
| 2026-03 | $653.84 | $636.71 | $653.84 | $642.05 | Secondary-market data provider |
| 2026-02 | $670.11 | $650.51 | $670.11 | $653.76 | Secondary-market data provider |
| 2026-01 | $634.91 | $634.91 | $671.83 | $670.36 | Secondary-market data provider |
| 2025-12 | $610.89 | $610.89 | $631.46 | $631.46 | Secondary-market data provider |
| 2025-11 | $608.51 | $604.48 | $614.51 | $607.04 | Secondary-market data provider |
| 2025-10 | $583.29 | $575.69 | $602.67 | $602.67 | Secondary-market data provider |
| 2025-09 | $597.84 | $579.46 | $597.84 | $583.93 | Secondary-market data provider |
| 2025-08 | $584.34 | $584.34 | $645.60 | $595.21 | Secondary-market data provider |
| 2025-07 | $601.39 | $588.67 | $602.85 | $588.97 | Secondary-market data provider |
| 2025-06 | $586.69 | $586.64 | $599.43 | $598.56 | Secondary-market data provider |
| 2025-05 | $563.74 | $535.65 | $580.30 | $579.72 | Secondary-market data provider |
| 2025-04 | $563.04 | $563.04 | $595.47 | $567.89 | Secondary-market data provider |
| 2025-03 | $541.68 | $540.89 | $571.47 | $564.45 | Secondary-market data provider |
| 2025-02 | $539.66 | $539.66 | $551.68 | $542.47 | Secondary-market data provider |
| 2025-01 | $559.66 | $538.36 | $595.76 | $538.75 | Secondary-market data provider |
| 2024-12 | $592.18 | $554.52 | $597.29 | $557.91 | Secondary-market data provider |
| 2024-11 | $585.67 | $585.67 | $607.35 | $591.33 | Secondary-market data provider |
| 2024-10 | $610.96 | $583.19 | $616.25 | $584.67 | Secondary-market data provider |
| 2024-09 | $671.61 | $611.66 | $703.87 | $616.21 | Secondary-market data provider |
MARKET ACTIVITY
Through Aug 2026
Sales and liquidity
Reported sealed-market sales and monthly price ranges for the latest 6 months.
Reported sales946-month total
Monthly average15.7reported sales
Active months6 / 6with at least one sale
3-month trend+18.6%51 vs 43 sales
LiquidityModerate activitybased on reported sales
Recent monthly price distributionLow · close · high
Aug 2026
$888.34
$726.82
$888.34
$969.09
17 sales
Jul 2026
$731.39
$635.69
$731.39
$779.23
17 sales
Jun 2026
$912.09
$746.26
$912.09
$995.01
17 sales
May 2026
$929.87
$808.20
$929.87
$990.70
9 sales
Apr 2026
$866.49
$708.95
$866.49
$945.26
15 sales
Mar 2026
$823.91
$716.11
$823.91
$877.81
19 sales
Activity labels describe reported historical sales only; they do not guarantee that a set can be sold immediately.
VALUE OUTLOOK
Growth and retirement
Total growthN/ACurrent sealed value vs MSRP
Annual growthN/A12-month close change
1-year forecast$782.65+4.4%
5-year forecast$992.01+32.3%
5-year range$943.00 – $1,023.00Collected estimate
Used value range$375.58 – $461.64Observed market range
MethodSource-provided projectionDisplayed as collected; BrickPriceWatch does not recalculate it.
Forecast sourceMarket data providerSource attached to the forecast fields.
Recorded history70 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.
A Mindstorms-era release from 2020 that retired in 2023, Robot Inventor is supported by the line's legacy and STEM interest, and its discontinuation plus specialized electronics have tightened future supply, while platform and app uncertainty add volatility for used copies and favor sealed holdings.
SET PRICE GUIDE
LEGO 51515-1 Robot Inventor price, value and history
LEGO 51515-1 Robot Inventor is a set released in 2020 in the Mindstorms theme with 949 pieces. This BrickPriceWatch price guide combines a current new and sealed value of $749.99, an original retail price of $359.99, and 70 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 $384.70. The set is recorded as retired.
Current market dataa current new and sealed value of $749.99
Retail comparisonan original retail price of $359.99
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.
More from Mindstorms
Ranked by shared subtheme, similar market value, build size, and release year.
