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Borderlands 2 + Season pass are on sale for 20% off each at Get Games. Both BL2 and the DLC require Steam activation.
BL2 Sale
Borderlands 2 = $47.99 / £23.99 / €39.99
Borderlands 2: Season Pass = $23.99 / £19.99 / €29.99
The new class was recently unlocked for the game.