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There’s a sale on Valve games going on at GameFly / GameFly UK. Don’t forget to use their 20% off coupon for extra savings.
Valve Sale
Portal 2 = $4.99
Half-Life 2 = $2.49
Half-Life 2: Episode 1 = $1.99
Half-Life 2: Episode Two = $1.99
Left 4 Dead 2 = $4.99
Left 4 Dead = $4.99
The Orange Box = $4.99
Counter-Strike: Source = $4.99
Counter-Strike: Condition Zero = $2.49
Team Fortress Classic = $1.25
All of the games use Steamworks (of course).