It's not much, but every little bit helps... the used price dropped another $5 to $44.99, use this in conjunction with your EB / GS discount card and the game becomes $40.49, which is $20 off a brand new copy.
http://www.gamestop.com/product.asp?product_id=952013
http://www.gamestop.com/product.asp?product_id=952013