Call of Duty Black Ops, Best trade in Value?

[iceytoa1]

So I want to trade in Call of Duty Black Ops for the Xbox 360.

Best i've found is £20 anyone heard any better?

 

[Lost_In_Shadows]

It trades in for 32 at Amazon if you want to go that route.

 

[iceytoa1]

£32?
I was there earlier and it said £20.01?