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GameFly / GameFly UK has some Midweek Meltdown Deals listed on their site.
Dead Island Game of the Year Edition = $6.79 (Steam)
PAYDAY: The Heist = $4.99 (Steam)
Killing Floor = $4.99 (Steam)
Renegade Ops = $3.75 (Steam)
Dungeon Defenders = $3.75 (Steam)
Guild Wars 2 Standard Edition = $49.99