I have 8 GBA games, 4 Gameboy games and 2 PSP games. How much store

From the second you buy the game, the price depriciates. Depending on when you bought the game, and it's condition is how much it's worth.
A game that came out 2 months ago in perfect condition, will be worth more than a game that came out 2 years ago in perfect condition. If you don't have the manuals or the disc cover you'll lose ALOT in value. Also, it's how much you paid for them originally, a 30$ game, is going to be much less than 30$. For my xbox games(50$), my trade-in's were like 30 bucks if the cd was in good condition (they open up the cover and look pretty closely at the disc for bad scratches) and had the manual and the cover...

Sadly, hes not lying. They dont give jack worth any games. They only give 30 for GTA4 which is 60 to buy. Id try to sell them other places, like ebay or craigslist or even a pawn shop. You might get more.

8 gba games $5
4 game boy games $2
2 psp games $10-20$

it really depends on what game you are selling because yesterday i went to game stop and how much would the give for ps2 guitar hero 3 and wireless guitar and it was on 25$

id buy the gba games for 20£