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GMG has some 4 packs on sale for deep discounts. Should stack with their current 20% off voucher. (Active vouchers are listed on the Promo & Coupon Codes page).
Awesomenauts 4 Pack = $10 (Steam)
Dollar Dash 4 Pack = $9.89 (Steam)
Foreign Legion: Multi Massacre – 4 Pack = $7 (Steam)
Frozen Synapse 4 Pack = $25 (Steam)
Lunar Flight – 4 Pack = $10 (Steam)
Operation Flashpoint Red River – 4 Pack = $15 (Steam)
Chivalry – 4 Pack = $25 (Steam)
Eve Online 30 Day Starter Pack – Amarr Explorer 4 Pack = $20
Eve Online 30 Day Starter Pack – Asteroid Miner 4 Pack = $20
Gettysburg: Armored Warfare 4 Pack = $10 (Steam)
Sanctum 4 Pack = $10 (Steam)
Sniper Elite: Nazi Zombie Army 4-Pack = $15 (Steam)
Sanctum 2 – 4 Pack = $15 (Steam)
Killing Floor – 4 Pack = $20 (Steam)
Starvoid – 4 Pack = $10 (Steam)
Sonic and All-Stars Racing Transformed 4 Pack = $15 (Steam)