Twilight Games For Boys How Much Will Gamestop Give Me For The Following?

How much will gamestop give me for the following? - twilight games for boys

1 book DS Pokemon, Zelda: Twilight Princess Wii books, old Nintendo games, 21 PS2 games, 3 Wii games are (as $ 20 each, and 1 is the Wii Zapper), 2 Game Boy Advance games 3 DS games, 1 PSP movie, 4 movies on DVD, 2 DVD movies (but never opened) and 1 Logitech PS2 headset.