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OnLive offers downloads of Space Pirates and Zombies (S.P.A.Z.) for Windows or Mac (pictured) for free. (Click "Redeem" to see this game.) That's $10 under our September mention and the lowest price we could find by $10.
Also available are downloads of SpaceChem for Windows or Mac for free. That's the lowest price we could find by $10. Both deals end August 19.
Note that these games can only be played on the OnLive service.