How much cash would i get if i traded in forza motorsport 3?

i bought the limited edition forza motorsport 3 for the xbox 360 for 拢50, i still have the manual, key6ring and memory stick with it. but i would want money to spend on other things, not points on my game card, does anyone know how much i'll get?How much cash would i get if i traded in forza motorsport 3?
Not enough,,

Probably 20 pounds or 30 @ the most very unlikely any higher then 20.

Aint worth it stick with the game.How much cash would i get if i traded in forza motorsport 3?
Since its kinda new u would probably get 40% of the real amount wich is around $25How much cash would i get if i traded in forza motorsport 3?
Should be around 拢20-拢30. CEX is giving 拢29.