I have an ATT iPhone 4S 32gb and I want to upgrade to the 5S. Can I sell my 4S to gamestop or somewhere to recover most of the cost after I get it?
Craigslist/Ebay... If you trade it in at a store, you will only get a fraction of the difference. You also get more in gamestop credit rather than straight cash, making that difference even larger.
You do make a little of it back with convenience and knowing that you won't get scammed out of your money and iPhone (it is something that is always in the back of my mind when I buy, sell, or trade with the public).