Buying an iphone but don't know where so

Ok so I saw that the iphone 5 at walmart is at 549$ great deal and i don't know how much it is at apple but I wonder is how much credit would they give me for my iphone 4 perfect conditions not cracked at walmart or either apple please help!

Some phone companies do not allow you to purchase phones from an outside source so I would check in with your dealer first I see any rules regarding new phones. If your getting a iPhone 5 apple has a refinishing program which means they give you a used phone but with a new screen and that is reset to factory default. This works very we'll if you don't mind a used interior and has a warranty usually. If you dealer allows this i suggest using the apple refurbishing program