How much will i get for a ps2?

PS2 SLIM, 2 CONTOLLERS, 2 GUITARS, 2 MEMORY CARDS, GUITAR HERO 1,2 AND 3, MADDEN 05 COLLECTORS ADDITION, BURNOUT DOMINATOR, NEED FOR SPEED CARBON, GOD OF WAR 2, NFL STREETS 3, MADDEN 07, AND TONY HAWK UNDERGROUND 2. HOW MUCH DO YOU THINK I WILL GET FOR TRADE IN AND CASH AT GAMESTOP