Feral Interactive is celebrating the upcoming release of BioShock Infinite on the Mac by offering the first two installments of the BioShock series for 50% off. From now until September 3rd, you can get BioShock and BioShock 2 for US$9.99 each in the Mac App Store.

Both games normally cost $19.99. The games are set in the fictional underwater city of Rapture in an alternate 1960s. Since their original release, each game has won myriad gaming awards and both are considered classics.

This Thursday, August 29th, BioShock Infinite will be released on the Mac App Store. BioShock Infinite takes place nearly 50 years before the first two games.

Upon its release on other platforms in March of this year, the game went on to become one of the highest-rated games of all time, with Electronic Gaming Month, Game Informer, Eurogamer, and the Official PlayStation Magazine all giving it a 10 out of 10.

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