not sure if it's any use, but I just seen my steam inventory has some stuff
-50% off Nihilumbra
-66% off KnightShift
-90% off Hamiltons Great Adventure
-66% off Divekick
-75% off Revenge of the Titans
-75% off Titan Attacks
-50% off Montague's Mount
-50% off Jane's Advanced Strike Fighters
-50% off Killing Floor