I believe they only post trade in values online for special promotions like "these games will trade in for $15 or more". I could be wrong though.
You're right. They don't post values of all games. It's part of their strategy to get you into the store, offer you jack shit, but hope that you already dragged all your stuff there that you will settle for whatever pittens they will give you. In short, never trade or sell games to GameStop unless you are unable to sell them outright to another person like via eBay. You could try calling to ask what games are worth but chances are they will be too busy, or too lazy and claim to be too busy to answer your question and suggest you come to the store with your games.
Mottzilla is correct - They keep changing prices at will, so theres no good way to get the price. Also, they tell the employees not to give out prices over the phone, so you have to come in and once you are there - you just want to get out.
In my general experience, they give around a third for what they sell it for used (which is usually 10% less than new). As the title gets older this formula breaks down as it is then heavily based on demand/stock, etc. This is based on experience from 5 years ago, so I'm not sure it still holds up,but it might give you a ballpark.
Unless the game is less then six months old, your trade in value will be very low, basically $10 or less. I wouldn't even try getting money back, store credit is the best way to go.
You could see what a particular game is sold for used thru online website. Bear in mind your gain will be that one third or even one fifth of the posted sell price. PS2 list for example: http://www.gamestop.com/Browse/Search.aspx?N=139 I think you would lose too much selling thru Gamestop. I think the best way to profit is sell the games individually yourself thru Craigs list or EBay.
Thanks for the help. I decided to forget buying just to resell and just grabbed what I wanted. Made a good score too.
Never sell to Gamestop, Microplay, etc. They will always give you crap-all for what you offer, even if it's rare. Those guys at the counter don't know jack, and whatever you sell them will simply get abused with stickers and other crap and put back on the shelf where people can man-handle it.
If you're a member of eBay, then you can check the prices of listings for completed auctions. It's a nice barometer for gauging your videogame selling price. I used to do that all the time for games I wasn't sure of setting a price on. eBay also gave me ammo to shut up naysayers on online game console stores. You know.. like Virtual Console. I used to hear people say "VIRTUAL CONSOLE IS A RIPOFF YOU CAN BUY THESE GAMES FOR $1 AT THE LOCAL SWAPMEET OR ON EBAY." I'm sure everyone has a conveniently located swap meet nearby that sells exactly the same game for the (retro) console you're interested in. I'm also sure that those sellers aren't stupid enough to jack up the sale price due to the "retro boom". I'm EXTREMELY sure that the $1 game you buy on eBay doesn't include $3-5 shipping. Yeah, the VC prices sure are a ripoff. sarcasm and tangent end\ eBay is probably the "best" measure of pricing your games. Take that with caution, though.
For future reference, you can try: http://www.cheapassgamer.com/forums/cagomatic.php?do=tradein User submitted trade in values from Gamestop.
