[starvs]

Worst case scenario you could buy a new copy of the broken game at best buy (or anywhere they offer insurance, I know they have it a BB for five bucks though). Then take the broken copy and put it in the new case you have insurance for, take it back and get an exchange. Then you have two copies of the same game course, so you have to return one to gamestop or bestbuy with the receipt from the original purchase. They may scan the game to make sure its the same copy with the same bar code, which it won't be because you switched. If they do that and it doesn't work then you just sell one of the copies on ebay. You'll lose some money, but it will only be like 20 bucks max, instead of 60.

My xbox is horrible and eats my games all the time, so I had to deal with this a lot.

Edit: In my experience eb/gamestop are dicks about exchanges and your just SOL, but maybe you'll get someone nice and they will let it slide. Also I wrote this while playing Mass Effect, so it may not be all that coherent.