4 of these in existance, possibly one on outpost

http://www.tf2outpost.com/trade/13076495 - B/O $220/5.5 buds

Doesn't look to have been traded for anything, probably on loan to a friend or something like that since the trade is open

http://www.tf2outpost.com/trade/12149298

Sold for Anti Freeze Electric Escorter(~4 buds) - outlier

Proof: http://backpack.tf/id/76561198021272428?time=1372489200 -> http://backpack.tf/id/76561198021272428?time=1372575600

Next owner didn't list it on outpost, but looks like he sold it for an Antifreeze Virus Doctor(~6.2 buds)

Proof: http://backpack.tf/id/76561198044853174?time=1373094000 -> http://backpack.tf/id/76561198044853174?time=1373180400

http://www.tf2outpost.com/trade/11690971

Sold for Roboactive Hound Dog(a 1 of 1 hat with no price, this was its only sale, it is not on the market anymore)

http://www.tf2outpost.com/trade/12471102

Sold for Stormy 13th Fancy Fedora(no price)

http://www.tf2outpost.com/trade/11884539 (2-3 months ago)

Sold for P. Energy Drill + 4 buds + Big Kill(~11 keys) + 2 Black Bills(~8 keys ea) + TS Bills(~7) = ~9.5 buds

Proof: http://backpack.tf/id/76561197969049043?time=1372402800 -> http://backpack.tf/id/76561197969049043?time=1372489200

http://www.tf2outpost.com/trade/11218381 (2-3 months ago)

Sold for the duped Steaming Noh Mercy(~9.3 buds)

Proof: http://backpack.tf/id/76561198044950748?time=1371193200 -> http://backpack.tf/id/76561198044950748?time=1371279600

http://www.tf2outpost.com/trade/10989143 - B/O 9 (3-4 months ago)

Sold for Burning Ze Goggles(~3.5) + 42 keys + Dirty Juju(~7 keys) + Big Kill(~11 keys) = ~6.2 buds

Price Talk - Suggested Price: 5.5 - 6.2 buds

There are quite a few different sales on this thing. While there were 2 sales above 9 a few months ago, as well as a sale for ~6.2, we have more current data than that so it is more appropriate to go by that instead. In total for the range, there are 2 sales at 6.2, and one up right now with a B/O of 5.5. The sale for ~4 is far too low to be included for this hat, so it is considered an outlier.