Keep in mind there are many duped hats on the market.

Sale 1

http://www.tf2outpost.com/trade/22090073 - Sold for a Steaming Charmer's Chapeau (1.6 buds) and a Stormy Storm Milkman (1.4 buds) = 3*0.9 = 2.7 buds

Mini for Stormy Storm Milkman

http://backpack.tf/vote/id/53fdf8564ed7b826598b48a6

= 1.4 buds

Sale 2

http://www.tf2outpost.com/trade/19331378 - Sold for a Disco Beat Down Samur-Eye (5.3*0.9 = 4.8 buds) (Outlier, 3rd gens are going to drop anyway)

Sale 3

http://www.tf2outpost.com/trade/22123929 - Sold for a Sunbeams Sober Stuntman (2.5*0.9 = 2.3 buds)

Unused sale

http://www.tf2outpost.com/trade/21482260 - Sold with a Disco Beat Down Cloud Crasher for a Miami Nights Frickin' Sweet Ninja Hood (Should leave it untouched)

Feel free to counter / support my proofs.