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GamersGate / GamersGate UK has a couple of new sales at their site.
Batman 72 hour sale
Batman Arkham City Game of the Year Edition $5
Batman Arkham City: Harley Quinn’s Revenge DLC $2.49
Batman Arkham Collection $27.50
Batman Arkham Origins: Season Pass $5
Batman Complete Collection $37.50
Batman: Arkham Asylum Game of the Year Edition $5
Batman: Arkham Origins $5
Batman: Arkham Origins Blackgate Deluxe Edition $5
Batman™: Arkham Origins – Cold, Cold Heart DLC $2.50
Guild of Dungeoneering Deals
Guild of Dungeoneering $9
Guild of Dungeoneering Deluxe Edition $13.79