Set prices › Hero Factory › 40084
LEGO® Brain Attack polybag 40084
Prices updated Oct 8, 2026, 23:31 UTC.
Price history
Monthly average of real sales, in USD at today's exchange rate.
What is LEGO Brain Attack polybag 40084 worth?
A new, sealed Brain Attack polybag (40084) sold for $10.74 on average over the last six months, across 26 sales. LEGO no longer sells it in the US, so collectors set the price.
Set facts
- Set number
- 40084
- Pieces
- 6
- Released
- 2013
- Theme
- Hero Factory
- Price per piece
- $1.79
- Status
- Retired
Questions
Is LEGO 40084 Brain Attack polybag retired?
Yes. LEGO no longer sells Brain Attack polybag in the US, so its value now comes from what collectors pay for it: $10.74 new on average over the last six months.
How are these prices calculated?
Values are quantity-weighted averages of real sales of the set over the last six months, updated every night. LEGO retail prices come from Brickset. Other currencies are converted at the European Central Bank's daily rate.
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