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Use the voucher code GMG30-ALIEN-SDEAL at Green Man Gaming to get 30% off the pre-purchase of Aliens: Colonial Marines. The final price ends up being $35.00 plus you can opt for $2 cashback or $3 GMG creditback. The voucher is only valid for about another 22 hours.
This is a Steamworks game. Steam activation is required.
Release date is February 12, 2013.