If you haven't played Portal 1 yet then this would be the best deal to go for...otherwise SimplyGames have it for £24.85
* Extensive single player: Featuring next generation gameplay and a wildly-engrossing story.
* Complete two-person co-op: Multiplayer game featuring its own dedicated story, characters, and gameplay.
* Advanced physics: Allows for the creation of a whole new range of interesting challenges, producing a much larger but not harder game.
* Original music.
* Massive sequel: The original Portal was named 2007's Game of the Year by over 30 publications worldwide.
* Editing Tools: Portal 2 editing tools will be included. Note: To be made available after launch