Set 42121
Heavy-Duty Excavator
Retired Oct 2022Retail price$39.99What LEGO charged
Worth now$76.00Based on 4 recent sealed sales
Asking now$146.94Typical price on 26 eBay listings
vs retail+90%Worth more than it cost
Proven performer
Up 90% on its $40 retail price since retiring. Pay under $38 to still make a margin reselling.
How much is LEGO 42121 Heavy-Duty Excavator worth?
LEGO 42121 Heavy-Duty Excavator is worth about $76.00 sealed right now, based on 4 recent sealed sales. That's 90% above its $39.99 retail price. It came out in 2021 with 569 pieces. It was retired in Oct 2022. Over the last 82 days its typical asking price has risen 9%, from $134.99 to $146.94. We last checked it 8 days ago.
Price history
Value history
Oct 18$14726 listings
- Lowest
- $120
- Highest
- $147
- Change
- +9%
- Asking vs retail
- +267%
26 observations · median asking · rechecked 8× daily
Should you buy it?
Sellers want $147, but it’s actually been going for $76. Offer low.
If you bought it to resell
Sells sealed for$76
Marketplace fees · 15.25%−$12
Payment processing · 2.9% + $0.30−$3
Shipping · est. from 569 pieces−$13
Reaches you$49
Pay no more than$37
For a 30% return at your costs. Change them and every figure on the site follows.
What it actually sold for
Sealed
$76
4 sold in six months · $60–$84Used
$39
2 sold in six monthsSellers are asking 93% more than buyers actually paid. The $147 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$66vsSealed$76
Sealed is worth 13% more. Not one to break.
- Minifigures
- —
- Loose parts
- 601 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
- 42121
- Theme
- Technic
- Released
- 2021
- Status
- Retired Oct 2022
- Pieces
- 569
- Minifigures
- —
- Retail price
- $39.99
- Value per piece
- $0.258
- Price confidence
- high · 26 listings
- Last checked
- 8 days ago
Where these numbers come from
eBay26 live listingsThe asking price here — the median of what sellers want right now, $147. Last checked Oct 18.See the listings →BrickLink4 completed salesWhat it actually sold for — $76 across six months of real transactions. Last checked Oct 24.Open the price guide →Catalogue569 piecesPiece counts, minifigures, release year and retail price come from Rebrickable and Brickset. Retail was $40.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.
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