No you can't.
yes
Unfortunately, GameStop does not sell game cases. You can find game cases on eBay.
You can use any games you have bought from anywhere and trade them into gamestop to get Game stop in store credits to purchase other games.
No there is only the Gamestop site that tells what Gamestop sells the games for
yeah go to gamestop
it depends on which game it is
GameStop or EBGames.
Sometimes.
Yes
If you mean the cases that the video games come in then no. Not unless the video game is in the case.
If you trade in a game for another game you normally have to pay them some.
Yes