The Orange Box was always one of the best PC gaming deals on offer. You got all three parts of Half Life 2, the amazingly funny Portal & Team Fortress 2 all in one boxed set. I've just come back from Sainsburys in Camberley and you can pick this up for five measly pounds. This must be a record low! Amazon still have this on sale for £11.08. Game have it on at £14.99.
If you don't already have this in your collection, rush out and get it. You won't be disappointed.