Set 71720
Fire Stone Mech
Retired Oct 2021Retail price$69.99What LEGO charged
Worth now$119.99Typical sealed asking price · 30 listings
Recently sold$100.00Only 1 sale so far — too few to lean on
vs retail+71%Worth more than it cost
Holding value
71% above its $70 retail price. Steady rather than spectacular.
How much is LEGO 71720 Fire Stone Mech worth?
LEGO 71720 Fire Stone Mech is worth about $119.99 sealed right now, based on 30 live sealed listings on eBay. That's 71% above its $69.99 retail price. It came out in 2020 with 977 pieces and 5 minifigures. It was retired in Oct 2021. Over the last 83 days its typical asking price has fallen 2%, from $122.47 to $119.99. We last checked it 9 days ago.
Price history
Value history
Oct 19$12030 listings
- Lowest
- $115
- Highest
- $122
- Change
- -2%
- Asking vs retail
- +71%
26 observations · median asking · rechecked 8× daily
Should you buy it?
Up 71% on retail since retiring. A proper hold.
If you bought it to resell
Sells sealed for$120
Marketplace fees · 15.25%−$18
Payment processing · 2.9% + $0.30−$4
Shipping · est. from 977 pieces−$18
Reaches you$79
Pay no more than$61
For a 30% return at your costs. Change them and every figure on the site follows.
What it actually sold for
Sealed
$100
1 sold in six monthsUsed
$70
1 sold in six monthsSellers are asking 20% more than buyers actually paid. The $120 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$163vsSealed$120
Parting it out is worth about 36% more than selling it sealed — that gap is why this set gets broken.
- Minifigures
- $55
- Loose parts
- 982 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
- 71720
- Theme
- Ninjago
- Released
- 2020
- Status
- Retired Oct 2021
- Pieces
- 977
- Minifigures
- 5
- Retail price
- $69.99
- Value per piece
- $0.123
- 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, $120. Last checked Oct 19.See the listings →BrickLink1 completed salesWhat it actually sold for — $100 across six months of real transactions. Last checked Oct 28.Open the price guide →Catalogue977 piecesPiece counts, minifigures, release year and retail price come from Rebrickable and Brickset. Retail was $70.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 Ninjago sets from around 2020
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▲ 179% vs retailRetired71722 · 2020Skull Sorcerer's DungeonsNinjago · 1,181 pcs$27913 listings · retail $100Proven performer
▲ 157% vs retailRetired71717 · 2020Journey to the Skull DungeonsNinjago · 402 pcs$7725 listings · retail $30Proven performer