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GameFly / GameFly UK has a 2K Games Weekend Sale up. Save up to 80% off. It looks like any purchase also includes a copy of Bioshock 2.
BioShock $5
BioShock Infinite $7.49 (Steam)
BioShock Infinite: Burial at Sea Episode One $7.49 (Steam)
BioShock Infinite: Burial at Sea Episode Two $7.49 (Steam)
Borderlands 2 – Season Pass $9.89 (Steam)
Borderlands 2 $5 (Steam)
Borderlands 2 Game of the Year Edition $10 (Steam)
Borderlands Game of the Year Edition $7.49 (Steam)
Mafia II $7.49 (Steam)
Spec Ops: The Line $6 (Steam)
The Bureau: XCOM Declassified $4 (Steam)
The Darkness II $6 (Steam)
XCOM: Enemy Unknown – The Complete Edition $16.49 (Steam)