Borderlands Game of the Year edition for 360/PS3 is on sale for $9.99 at Best Buy with a preorder of Borderlands 2. The GotY edition includes all 4 DLC expansions. If you haven't played this game yet, DO IT NOW. It is amazing.
Also if you don't want to keep the preorder, you can always cancel it. I don't think they will give you your $5 in cash back, but they will give you a $5 gift card.
P.S. for some reason it won't let me search for "Borderlands" to attach this to it?