Set 21355
The Evolution of STEM
On shelves nowRetail price$79.99What LEGO charged
Worth now$48.99Based on 3 recent sealed sales
Asking now$75.00Typical price on 21 eBay listings
vs retail−39%Worth less than shop price
Not at retail
At $80 retail there's no margin left — pay under $21.
How much is LEGO 21355 The Evolution of STEM worth?
LEGO 21355 The Evolution of STEM is worth about $48.99 sealed right now, based on 3 recent sealed sales. That's 39% below its $79.99 retail price. It came out in 2025 with 879 pieces and 3 minifigures. It's still sold in shops. Over the last 88 days its typical asking price has risen 4%, from $71.99 to $75.00. We last checked it yesterday.
Price history
Value history
Oct 26$7521 listings
- Lowest
- $70
- Highest
- $75
- Change
- +7%
- Asking vs retail
- -6%
27 observations · median asking · rechecked 8× daily
Should you buy it?
Sellers want $75, but it’s actually been going for $49. Offer low.
If you bought it to resell
Sells sealed for$49
Marketplace fees · 15.25%−$7
Payment processing · 2.9% + $0.30−$2
Shipping · est. from 879 pieces−$18
Reaches you$21
Pay no more than$16
For a 30% return at your costs. Change them and every figure on the site follows.
How long has it been on shelves?
Still early — released 2025, and sets like this usually run about 3 years. No hurry.
LEGO never announces retirement dates. This is only how long the set has been available against how long sets of its size usually run — not a prediction, and not inside information.
What it actually sold for
Sealed
$49
3 sold in six months · $45–$51Sellers are asking 53% more than buyers actually paid. The $75 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$128vsSealed$49
Parting it out is worth about 162% more than selling it sealed — that gap is why this set gets broken.
- Minifigures
- $23
- Loose parts
- 956 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
- 21355
- Theme
- LEGO Ideas and CUUSOO
- Released
- 2025
- Status
- On shelves now
- Pieces
- 879
- Minifigures
- 3
- Retail price
- $79.99
- Value per piece
- $0.085
- Price confidence
- high · 21 listings
- Last checked
- yesterday
Where these numbers come from
eBay21 live listingsThe asking price here — the median of what sellers want right now, $75. Last checked Oct 26.See the listings →BrickLink3 completed salesWhat it actually sold for — $49 across six months of real transactions. Last checked Oct 23.Open the price guide →Catalogue879 piecesPiece counts, minifigures, release year and retail price come from Rebrickable and Brickset. Retail was $80.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 LEGO Ideas and CUUSOO sets from around 2025
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