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Deus Ex: Human Revolution is on sale for 50% off at OnLive / OnLive UK as the SGA weekly deal. Deals are on the standard and augmented editions.
– Deus Ex: Human Revolution = $14.99 / £9.99
– Deus Ex: Human Revolution – Augmented Edition = $19.99 / £12.49
It looks like there’s a Batman game sale going on too. Only about 30% off though.
OnLive is a cloud gaming site. You don’t actually download the game but you play remotely through their service.