How much money would i get from gamestop if i traded in MW2, COD World at War, BFBC2, Dead Rising 2, and CODBO?

I say around 65-70.How much money would i get from gamestop if i traded in MW2, COD World at War, BFBC2, Dead Rising 2, and CODBO?
probably like $35How much money would i get from gamestop if i traded in MW2, COD World at War, BFBC2, Dead Rising 2, and CODBO?
I don't know the exact going rates on them atm, but I wouldn't expect more than 30-40 dollars.