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The Mac Game Store is running an Aspyer Games Sale for the weekend. Some of those games are Steamplay.
Some of the good deals listed below:
Bioshock Infinite $15 (Steam)
Bioshock Infinite DLC $3.74 – $11.24 each. (Steam)
Borderlands 2 $10 (Steam)
Borderlands 2 GOTY $20 (Steam)
Borderlands 2 Season Pass $22.49 (Steam)
Borderlands 2 DLC $2.24 – $7.49 each. (Steam)