Proof below. None on the market.

This is an increase from the originally suggested price from previous suggestion 6 months ago.

Sales:

http://www.tf2outpost.com/trade/13120060

-b/o of 5 buds, old trade

-sold for 4 buds 3 months ago

-notable offers within 3 months:

supposedly had another offer of 4 buds

c9 crocleather=4 then

rejected 66 keys=3 then

rejected 3 buds+5 keys=3.2 then

http://www.tf2outpost.com/trade/13067331

-b/o of 5 buds, 3 months old

-chapeau+3 buds bought duped pe chapeau: http://www.tf2outpost.com/trade/13308430

-4 buds then

-no notable offers

http://www.tf2outpost.com/trade/13446379

-wanted 'quick' 4 buds, sold in more than a week, 3 months old

-seems to have sold for this smoking tc: http://www.tf2outpost.com/trade/13734829 =4.1, higher than what he wanted so this sale is 4 buds, also seeing as many would have taken 4 pure immediately

-notable offers:

4 buds, bought another one

3 buds+5 keys (offered above)=3.2 too low

3.5 buds

nnb muffs+stormy fez=3.5 then

http://www.tf2outpost.com/trade/13823209

-wanted 4 buds, 3 months old

-seems to have sold for pe noir+sf knife: http://www.tf2outpost.com/trade/14000323

-~3.4 buds

http://www.tf2outpost.com/trade/14020604

-probably wanted 4 buds, 2 months old

-chapeau+3 buds bought pe chapeau: http://www.tf2outpost.com/trade/14305015

-buyer's bp:

http://backpack.tf/id/76561198045126277?time=1378710000

http://backpack.tf/id/76561198045126277?time=1378796400

-4 buds

http://www.tf2outpost.com/trade/14308430

-2 months old

-notable offers:

spectral max (seller valued it at 3)+11 keys=3.5

-seems to have sold for blizz stash+1 bud: http://www.tf2outpost.com/trade/14414665

-3.3 buds

No current trades.

Low and high ends from sales, offers within the range support this. Slightly old proof but still valid, this isn't a very common hat. Unusual overpay and original prices used.