http://backpack.tf/vote/id/50212ba99ae21a6474000000 - 100% upvote...

Sale 1

http://www.tf2outpost.com/trade/21920333 - Sold for a Stormy Storm Wraith Wrap (3.4*0.9 = 3.1 buds)

Sale 2

http://www.tf2outpost.com/trade/20235111 - Sold for a Orbiting Fire Bonk Boy (2.9*0.9 = 2.6 buds)

Unused sales

http://www.tf2outpost.com/trade/22265779 - Sold for a Terror-Watt Federal Casemaker

http://www.tf2outpost.com/trade/21570779 - Sold for a Sunbeams Pyro's Boron Beanie

http://www.tf2outpost.com/trade/21872857 - Sold for a Blizzardy Storm Soldier's Slope Scopers

Will base those hats price on this.

Feel free to counter / support my proofs.