Approximately how much could i get for trading the following games into gamestop?

I know gamestop sucks and rips people off, but I need money asap. How much would I get for (all in fairly good condition): Modern Warfare 2, World at War, Halo 3: ODST, Left 4 Dead 2, Lord of the Rings: Conquest, Resident evil 5, and the Viva pinata banjo kazooie thingy?