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There’s a new 25% off voucher for Green Man Gaming. Runs from October 31st to November 9th, 2012. Says some games are excluded.
The voucher is GMG25-UAAHK-6AI9S
Stacks with some of their current promotions. For example (prices after the voucher):
Warhammer 40k: Space Marine = $5.62 – Steamworks
Crusader Kings II = $7.50 – Steamworks
King Arthur II: Dead Legions = $1.87 (Today Only) – Steamworks
Laxius Force = $5.25
Voucher does NOT work on Season pass for Borderlands 2.