In total I've bought:
A New Beginning, Battlefield 2142 + Northern Strike, Battlefield: Bad Company 2, Civilization III, Command & Conquer Ultimate Collection, Counter-Strike: Global Offensive, Deus Ex, Dragon Age + All DLC, Gemini Rue, Half-Life 2 + Both Expansions, Half-Life + Both Expansions, Hydrophobia: Prophecy, Insurgency, Interstellar Marines, Left 4 Dead 2, Left 4 Dead, Mass Effect 3 + All DLC, Rising Storm, Skyrim + All DLC, Steam Marines, System Shock 2, Team Fortress Classic, Terraria, To The Moon + Soundtrack (thanks to Scourge of Ages) and X-COM: Enemy Unknown
I am also trying to get Guild Wars 2 for free by making a Guild Wars 2 Oath video. And there goes my disposable income, the rest of my money is going towards bills and my car.