I just noticed this when I broused Gamestop web site. Sorry if was already posted, but I did not found it.
Gamestop have on their web site Bioshock 2 (Xbox 360) for $24.99 NEW and $19.99 used (currently OOS) +tax
LINK:
http://www.gamestop.com/Catalog/ProductDetails.aspx?product_id=73955
But...