It depends on the game. Newer games and higher rated games will cost more than older, poor rated games. Used games such as Halo and Call of Duty are more expensive than something from 2004 for example. I tend to find that EB Games gives me my moneys worth when I buy used.
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It is worth between $100-150
Much less than a used PS2 and that is worth only $20-30
Retail, about $30. Used, much less.
Round about $10
if in good condition...........120