Team Fortress 2
Counter-Strike: Global Offensive
Comments can no longer be left on this suggestion.
Only recent sale:
Sold for a Purple Energy Respectless Rubber Glove, Strange Specialized Killstreak Big Earner, Strange Specialized Killstreak Australium Axtinguisher, Strange Festivized Specialized Killstreak Revolver and a Specialized Killstreak Fire Glazed Scotsman's Skullcutter (Factory New):
Total: ~41 keys