How much would i get if im selling DS < 2 games Gc < 7 games?

How much do I get if i sell DS) The last air bender and Zoo tycoon Ds Gamecube) Harry Potter and the Prisoner of Azkaban, The Sims 2 Pets, Home Run King, Curious George, All-Star baseball 2002, Power Rangers Dino Thunder, and Need for Speed: Hot pursuit 2. And should i get credit or sell it 4 money