Gamestation are doing a BOGOF offer on the following :
Perfect Dark Zero £29.99
Blazing Angels £29.99
Call of Duty 2 £29.99
NBA 2K7 £34.99 (only been out a week and getting great reviews)
All on buy one get one free. So thats £15 each (or £17.50 each if you go for the newest).
Instore and online offer