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Direct2Drive has a Borderlands Franchise Sale running.
Borderlands 2 $6
Borderlands 2 – Season Pass $9
Borderlands 2 Game of the Year Edition $12
Borderlands Game of the Year Edition $9
Borderlands Complete Bundle $48
Borderlands: The Pre-Sequel $30
Borderlands: The Pre-Sequel Season Pass $20.09
Borderlands: The Pre-Sequel AND Season Pass Bundle $39.59
Borderlands 2 $6
Borderlands 2 Game of the Year Edition $12
Borderlands: The Pre-Sequel $30
All activate on Steam.