Officially-licensed Steam seller Fanatical is running a big sale on Batman Arkham games. The Batman Bundle includes Batman: Arkham Asylum, Batman: Arkham City, Batman: Arkham Origins, Batman: Arkham Origins Blackgate, and Batman: Arkham Origins Season Pass for $8.99. A Steam account is required for activation.
Source: N4G PC The Batman Bundle packs four Batman Arkham games for .99