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There are some really really cheap games at GMG currently. The deals also stack with their current 25% off voucher GMG25-EVFWS-4Z4ZN. Keep in mind none of these will activate on Steam/Origin/Etc but some of them are lower than their usual trade in values once you factor in the extra 25% off.
Some of the deals are:
NecroVisioN: Lost Company = $0.49
World of Goo = $2.99
Reign: Conflict of Nations = $0.49
Trine = $2.99
Dark Sector = $2.99
Kings Bounty: The Legend = $2.99
Men of War: Red Tide = $0.49
Deus Ex: Game of the Year Edition = $2.99
Deus Ex: Invisible War = $2.99
Hitman: Blood Money = $1.99
Tomb Raider: Anniversary = $1.99
Avencast: Rise of the Mage = $2.99
Battlestations: Midway = $2.99
Beyond Divinity = $0.99
Bob Came in Pieces = $2.99
Commandos 3: Destination Berlin = $0.99
Death Track: Resurrection = $0.99
Disciples II: Gold Edition = $1.99
Faces of War = $0.99
Gobliiins Trilogy = $2.99
Hacker Evolution = $0.49
Imperium Romanum: Gold Edition = $0.99
Men of War = $0.99
Sniper: Ghost Warrior = $2.99
Tower Bloxx Deluxe = $0.49
Tropico 3 = $2.99
UFO: Aftermath = $0.49
Click here to see the games on sale for really really cheap at GMG.
Defcon Everybody Dies used to to sold for $0.49, up to yesterday.