Set 3804
Robotics Invention System, Version 2.0
RetiredRetail price—Not on file
Worth now$359.99Typical sealed asking price · 9 listings
Recently sold—No recent sales on file
vs retail—Needs both prices
No retail price on file
Worth $360 today, but without a retail price there's nothing to judge that against.
How much is LEGO 3804 Robotics Invention System, Version 2.0 worth?
LEGO 3804 Robotics Invention System, Version 2.0 is worth about $359.99 sealed right now, based on 9 live sealed listings on eBay. It came out in 2001 with 720 pieces. It's retired. We last checked it 2 days ago.
Price history
Value history
Oct 25$3609 listings
- Lowest
- $360
- Highest
- $360
- Change
- 0%
- Asking vs retail
- —
2 observations · median asking · rechecked 8× daily · early days — a line drawn through 2 readings shows what we measured, not a trend
Should you buy it?
If you bought it to resell
Sells sealed for$360
Marketplace fees · 15.25%−$55
Payment processing · 2.9% + $0.30−$11
Shipping · est. from 720 pieces−$13
Reaches you$281
Pay no more than$216
For a 30% return at your costs. Change them and every figure on the site follows.
What it actually sold for
Used
$50
1 sold in six monthsCompleted BrickLink transactions over the last six months. Real sales, not asking prices.
Set details
- Set number
- 3804
- Theme
- Mindstorms · RCX
- Released
- 2001
- Status
- Retired
- Pieces
- 720
- Minifigures
- —
- Retail price
- —
- Value per piece
- $0.5
- Price confidence
- medium · 9 listings
- Last checked
- 2 days ago
Where these numbers come from
eBay9 live listingsThe asking price here — the median of what sellers want right now, $360. Last checked Oct 25.See the listings →BrickLinkPrice guideNo completed sales recorded for this one yet. Last checked Oct 25.Open the price guide →Catalogue720 piecesPiece counts, minifigures, release year and retail price come from Rebrickable and Brickset.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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Retired9731 · 2000Vision Command [RCX Digital Colour Camera]Mindstorms · 140 pcs$554 listingsNot enough data
Retired9754 · 2000Dark Side Developer KitMindstorms · 578 pcs$2985 listingsNo retail price on file
▲ 138% vs retailRetired51515 · 2020Robot InventorMindstorms · 949 pcs$85825 listings · retail $360Holding value