Today they are sells Batman Arkham Asylum for £3.75 it's one of the 75% off type offers they do, but I think it's only for today. It costs about £7.00 on Amazon.
Portal 2 is also on offer it was £29.99 and it's been reduced to £26.99 but it says it includes a free copy of Portal 2 (Well it just says portal but I think it means Portal 2) to give to your friend. I'm guessing the co-op thing is important in this game.
Also there is an offer for 47 Square Enix games which is 87% off and will cost you £48.75. I don't think I'll be getting this myself, but I think I'll get Batman.
The 47 games:
Hitman 2: Silent Assassin, Hitman: Blood Money, Battlestations: Midway, Just Cause, Hitman: Codename 47, Deus Ex: Game of the Year Edition, Deus Ex: Invisible War, Thief: Deadly Shadows, Tomb Raider: Legend, Project: Snowblind, Rogue Trooper, Infernal, Tomb Raider: Anniversary, Kane and Lynch: Dead Men™, Conflict: Denied Ops, Tomb Raider: Underworld, Shellshock 2: Blood Trails, Battlestations Pacific, Just Cause 2, Yosumin!™, FINAL FANTASY XI, Gyromancer, Kane & Lynch 2: Dog Days, Kane & Lynch 2: The Doggie Bag, Kane & Lynch 2: Alliance Weapon Pack, Kane & Lynch 2: Multiplayer Masks Pack, Order of War™, Mini Ninjas, Flora's Fruit Farm, Just Cause 2: Bull's Eye Assault Rifle, Just Cause 2: Rico's Signature Gun DLC, Just Cause 2: Chevalier Classic, Just Cause 2: Agency Hovercraft, Just Cause 2: Monster Truck DLC, Just Cause 2: Black Market Aerial Pack DLC, Just Cause 2 - Black Market Boom Pack DLC, Lara Croft and the Guardian of Light, Batman: Arkham Asylum Game of the Year Edition, SEASON OF MYSTERY: The Cherry Blossom Murders, Supreme Commander 2, Supreme Commander 2: Infinite War Battle Pack, Front Mission Evolved, Front Mission Evolved: Map Pack, Front Mission Evolved: Last Stand, Front Mission Evolved: Wanzer Pack 2, Front Mission Evolved: Weapon Pack 2, Front Mission Evolved: Wanzer Pack 3.