Went to EB today, and traded in some 360 games, here are the values given to me. These are after the Edge card.
Tiger Woods 07 - 24.27
Rockstar Table Tennis - 5.50
Burnout Revenge - 16.57
Call of Duty 2 - 5.50
Saint's Row - 16.57
Project Gotham Racing 3 - 5.50