Set 71804
Arin's Battle Mech
Retired Jan 2026Retail price$15.99What LEGO charged
Worth now$19.99Typical sealed asking price · 30 listings
Recently sold$15.00Only 1 sale so far — too few to lean on
vs retail+25%Worth more than it cost
Holding value
25% above its $16 retail price. Steady rather than spectacular.
How much is LEGO 71804 Arin's Battle Mech worth?
LEGO 71804 Arin's Battle Mech is worth about $19.99 sealed right now, based on 30 live sealed listings on eBay. That's 25% above its $15.99 retail price. It came out in 2024 with 104 pieces and 2 minifigures. It was retired in Jan 2026. Over the last 82 days its typical asking price has risen 11%, from $17.99 to $19.99. We last checked it 9 days ago.
Price history
Value history
Oct 17$2030 listings
- Lowest
- $18
- Highest
- $20
- Change
- +11%
- Asking vs retail
- +25%
26 observations · median asking · rechecked 8× daily
Should you buy it?
30 listings behind this — one of the better-evidenced values on the site.
If you bought it to resell
Sells sealed for$20
Marketplace fees · 15.25%−$3
Payment processing · 2.9% + $0.30−$1
Shipping · est. from 104 pieces−$9
Reaches you$7
Pay no more than$5
For a 30% return at your costs. Change them and every figure on the site follows.
What it actually sold for
Sealed
$15
1 sold in six monthsUsed
$12
1 sold in six monthsSellers are asking 33% more than buyers actually paid. The $20 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.
Set details
- Set number
- 71804
- Theme
- Ninjago
- Released
- 2024
- Status
- Retired Jan 2026
- Pieces
- 104
- Minifigures
- 2
- Retail price
- $15.99
- Value per piece
- $0.192
- Price confidence
- high · 30 listings
- Last checked
- 9 days ago
Where these numbers come from
eBay30 live listingsThe asking price here — the median of what sellers want right now, $20. Last checked Oct 17.See the listings →BrickLink1 completed salesWhat it actually sold for — $15 across six months of real transactions. Last checked Oct 22.Open the price guide →Catalogue104 piecesPiece counts, minifigures, release year and retail price come from Rebrickable and Brickset. Retail was $16.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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