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Aliens: Colonial Marines is up for pre-purchase at GMG for $49.99. Use the voucher code GMG25-EVFWS-4Z4ZN and that price drops to $37.50 (25% off).
The game uses Steamworks, so Steam activation is required. The release date for the game is 2/13/2013.
Keep in mind my stance on GMG pre-purchases is to still only buy from them if you’re looking for the cheapest option and know that you m ight not be able to play as soon as the game unlocks.