Gamestation trade in deals

[NoCoolOnesLeft]

I have an unopened copy of Assassin's Creed 2 that I was going to trade into gamestation for Bioshock 2 (priced at £24) or maybe for Grid.

But does anyone know how much I'd get for it?

 

[skateraXVIII]

Uh, what's gamestation. I've never heard of it... Is it like Gamestop?