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Deus Ex Human Revolution is 30% off at Amazon and Homefront also on sale for 50% off as PC Digital Game Downloads. Deus Ex for a limited time comes with a code to unlock a Tactical Enhancement Pack. This includes a Huntsman Silverback double-barrel shotgun and Longsword Whisperhead Suppressed extreme range sniper rifle.
Both of these games uses Steamworks so you will need to activate them on Steam.
Usually the Amazon deals are region restricted to North America so if you’re not in NA, you can still pick Deus Ex for 28% off at Get Games.