Honestly, to be safe I'd switch to a different pre-order and drop $40 on Borderlands at Walmart. It's hit or miss if a CSR will give you the extra money, avoid the hassle and cancel the pre-order and switch it.
hey goomba, I would also like to get in on that Gamestop SFIV (360) action.
http://www.ebgames.com/Catalog/ProductDetails.aspx?product_id=71572
Lemme know if you're able to snag two copies.