Correcting a guy's suggestion with proof for this hat that isn't priced.

Sale#1

http://www.tf2outpost.com/trade/19239214

Sold for 3 pure.

Backpack of Seller

http://backpack.tf/profiles/76561198050493851?time=1403161200 Before

http://backpack.tf/profiles/76561198050493851?time=1403679600 After

Backpack of Buyer

http://backpack.tf/profiles/76561198028123455?time=1403679600 Before

http://backpack.tf/profiles/76561198028123455?time=1403766000 After

Total: ~3 buds.

Sale#2

http://www.tf2outpost.com/trade/20779746

Sold for a Miami Nights Black Watch + 1 key (~3.2 * .9 = ~2.9)

Backpack of seller

http://backpack.tf/profiles/76561198028123455?time=1403766000 Before

http://backpack.tf/profiles/76561198028123455?time=1404025200 After

Backpack of buyer

http://backpack.tf/profiles/76561198060959553?time=1404025200 Before

http://backpack.tf/profiles/76561198060959553?time=1404111600 After

Total: ~2.9 buds.

Only sales that are not more than 2 months old. Since 2.9 is close to 3, I'll leave it at 3.