Set 21129
The Mushroom Island
Retired Dec 2018Retail price$19.99What LEGO charged
Worth now$40.00Typical sealed asking price · 30 listings
Recently sold—No recent sales on file
vs retail+100%Worth more than it cost
Proven performer
Up 100% on its $20 retail price since retiring. Pay under $15 to still make a margin reselling.
How much is LEGO 21129 The Mushroom Island worth?
LEGO 21129 The Mushroom Island is worth about $40.00 sealed right now, based on 30 live sealed listings on eBay. That's 100% above its $19.99 retail price. It came out in 2017 with 247 pieces and 2 minifigures. It was retired in Dec 2018. Over the last 83 days its typical asking price has fallen 8%, from $43.34 to $40.00. We last checked it 5 days ago.
Price history
Value history
Oct 20$4030 listings
- Lowest
- $40
- Highest
- $45
- Change
- -8%
- Asking vs retail
- +100%
26 observations · median asking · rechecked 8× daily
Should you buy it?
Up 100% on retail since retiring. A proper hold.
If you bought it to resell
Sells sealed for$40
Marketplace fees · 15.25%−$6
Payment processing · 2.9% + $0.30−$2
Shipping · est. from 247 pieces−$9
Reaches you$23
Pay no more than$18
For a 30% return at your costs. Change them and every figure on the site follows.
What it actually sold for
Used
$16
2 sold in six monthsCompleted BrickLink transactions over the last six months. Real sales, not asking prices.
Set details
- Set number
- 21129
- Theme
- Minecraft
- Released
- 2017
- Status
- Retired Dec 2018
- Pieces
- 247
- Minifigures
- 2
- Retail price
- $19.99
- Value per piece
- $0.162
- Price confidence
- high · 30 listings
- Last checked
- 5 days ago
Where these numbers come from
eBay30 live listingsThe asking price here — the median of what sellers want right now, $40. Last checked Oct 20.See the listings →BrickLinkPrice guideNo completed sales recorded for this one yet. Last checked Oct 24.Open the price guide →Catalogue247 piecesPiece counts, minifigures, release year and retail price come from Rebrickable and Brickset. Retail was $20.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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