The Orange Box delivers five innovative action games from Valve - creators of the blockbuster Half Life franchise, in one box. The Orange Box includes Half-Life 2: Episode Two, Portal and Team Fortress 2 in addition to full versions of award-winning Half-Life 2 and Half-Life 2: Episode One for an engrossing first-person action experience.
Cheapest I can find at the moment
Also 5% RAC discount and quidco
edit: Thanks niminator xbox 360 added.
edit: Now showing PS3 out of stock.