Call of Duty: Black Ops PS3 and Xbox 360 for £29.99 at Argos down from £44.99. I am aware that it is £5 cheaper from Tesco Entertainment, but this is just for anyone who prefers to pick it up instore rather than have it delivered. You can simply reserve and collect instore.
They are also giving a deal where you can get the Ferrari: The Race Experience game for an extra £10 if you buy Call of Duty: Black Ops. Never heard of the game but for an extra £10 don't sound bad.