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There’s two sales going on at GameFly / GameFly UK. A SEGA and a Valve sale. There’s supposed to be new deals every day for both sales.
Valve Sale (All Steam)
Counter-Strike: Condition Zero $4
Counter-Strike: Source $8
Day of Defeat $2
Day of Defeat: Source $4
Half-Life $2.49
Half-Life 2 $2.49
Half-Life Blue Shift $1.25
Half-Life 2: Episode One $2
Half-Life 2: Episode Two $2
Half-Life Source $2.49
Left 4 Dead $8
Left 4 Dead 2 $8
Portal $4
Portal 2 $8
Team Fortress Classic $2
The Orange Box $8
Half-Life Complete $16
SEGA Sale
The Cave $3.75 (Steam)
Aliens: Colonial Marines $10 (Steam)
A bunch more are on sale for 50% off.