Gamestop is one of the better aftermarket game stores. Aftermarket stores buy and sell used games, offering gamers a chance to make back some money on a $50 game they just completed in 3 days. You can find better prices on games at Walmart and Best Buy, however its the customer service that makes it worth shopping there. If you have any questions about a game, the store clerks have played it, read the magazines about it and want to talk to you about it unlike other specialty stores. This gives those who don't know about games, a chance to make an informed decision.
PROS: Knowledgable clerks. They buy and sell used games.
CONS: Higher prices than Walmart and Best Buy.