Lost Planet is a Platinum game sold for $20 new its no way you will get $15 or $20 for trade-in, maybe $10 or less..
I do trade-ins once in a while but I don't like it at all they are a bunch of rip offs..
I wanted to trade-in my Forza Motor Sport 2 they were giving me $8 or $10 if I recall...I said hell no even the clerk said keep it is not worth trading the game is way better than that and I agreed..
My Trigger Happy Sixaxis controller