Set 51515
Robot Inventor
Retired Jun 2023Retail price$359.99What LEGO charged
Worth now$593.38Based on 4 recent sealed sales
Asking now$857.78Typical price on 25 eBay listings
vs retail+65%Worth more than it cost
Holding value
65% above its $360 retail price. Steady rather than spectacular.
How much is LEGO 51515 Robot Inventor worth?
LEGO 51515 Robot Inventor is worth about $593.38 sealed right now, based on 4 recent sealed sales. That's 65% above its $359.99 retail price. It came out in 2020 with 949 pieces. It was retired in Jun 2023. Over the last 82 days its typical asking price has risen 6%, from $812.49 to $857.78. We last checked it 7 days ago.
Price history
Value history
Oct 19$85825 listings
- Lowest
- $809
- Highest
- $889
- Change
- +6%
- Asking vs retail
- +138%
26 observations · median asking · rechecked 8× daily
Should you buy it?
Sellers want $858, but it’s actually been going for $593. Offer low.
If you bought it to resell
Sells sealed for$593
Marketplace fees · 15.25%−$90
Payment processing · 2.9% + $0.30−$18
Shipping · est. from 949 pieces−$18
Reaches you$467
Pay no more than$359
For a 30% return at your costs. Change them and every figure on the site follows.
What it actually sold for
Sealed
$593
4 sold in six months · $500–$650Used
$491
4 sold in six monthsSellers are asking 45% more than buyers actually paid. The $858 figure above is a ceiling; this is the floor to negotiate toward.
Completed BrickLink transactions over the last six months. Real sales, not asking prices.
Worth more in pieces?
Parted out$107vsSealed$593
Sealed is worth 82% more. Not one to break.
- Minifigures
- —
- Loose parts
- 974 pieces
Minifigure prices are real completed BrickLink sales. The parts figure is an estimate — the set’s own inventory at the catalogue average, not each piece priced individually. Treat it as a guide, and remember parting out is hours of work and many small sales.
Set details
- Set number
- 51515
- Theme
- Mindstorms
- Released
- 2020
- Status
- Retired Jun 2023
- Pieces
- 949
- Minifigures
- —
- Retail price
- $359.99
- Value per piece
- $0.904
- Price confidence
- high · 25 listings
- Last checked
- 7 days ago
Where these numbers come from
eBay25 live listingsThe asking price here — the median of what sellers want right now, $858. Last checked Oct 19.See the listings →BrickLink4 completed salesWhat it actually sold for — $593 across six months of real transactions. Last checked Oct 24.Open the price guide →Catalogue949 piecesPiece counts, minifigures, release year and retail price come from Rebrickable and Brickset. Retail was $360.See the catalogue entry →
eBay links are affiliate links — if you buy after clicking, we earn a small commission at no cost to you, and that is what pays for the site. BrickLink has no such programme, so those are plain links. Neither changes what we show or what we say about it.
How to read this. The value is the median of live sealed listings, after removing instructions, empty boxes, used sets, multi-set lots and implausible outliers. Real sale prices usually land below asking, so the buy-below figure is deliberately the conservative end of the range.
More Mindstorms sets from around 2020
See all →
Retired40413 · 2020Mini RobotsMindstorms · 366 pcs$3543 listingsNo retail price on file
▲ 33% vs retailRetired31313 · 2013Mindstorms EV3Mindstorms · 601 pcs$46416 listings · retail $350Holding value
▲ 29% vs retailRetired8547 · 2009Mindstorms NXT 2.0Mindstorms · 621 pcs$36310 listings · retail $280Holding value
Retired3804 · 2001Robotics Invention System, Version 2.0Mindstorms · 720 pcs$3609 listingsNo retail price on file