Outdated, Proof:

Recent Sales:

http://www.tf2outpost.com/trade/20388994 - sold for 2.5 buds

Sale = 2.5 bud

http://www.tf2outpost.com/trade/20408566 - added a strange Cockswain's mutton and chop for a rebel rouser

http://backpack.tf/item/2620633540 + http://backpack.tf/item/2590720108 -> http://backpack.tf/item/2368914174

Sale = 3.78 bud - 1 key ~ 3.7 bud Outlier sale.

http://www.tf2outpost.com/trade/20424429 - added 2 keys for a terror-watt rack

Sale = 2.85*0.9 ~ 2.6 bud - 2 keys ~ 2.5 bud

http://backpack.tf/profiles/76561198083234925?time=1403420400 Before

http://backpack.tf/profiles/76561198083234925?time=1403506800 After

Mini-suggestion for terror-watt rack -> http://backpack.tf/vote/id/53b1c29d4dd7b866288b48ad

Thanks Thor <3

Conclusion: Using 3 recent sales and with more (though outdated proof) that the 3.7 bud sale is an outlier. Note that the rest of the proof is from Thor's suggestion.

Outdated Sales:

http://www.tf2outpost.com/trade/18095892 (Trade was made 3 months ago though)

Sold for 2 buds + 13 keys = ~2.8

Backpack of Seller

http://backpack.tf/profiles/76561198050779001?time=1396076400 Before

http://backpack.tf/profiles/76561198050779001?time=1396422000 After

http://www.tf2outpost.com/trade/17972289 Sold for 2 buds. (4 months ago)

http://www.tf2outpost.com/trade/17985801 If you checked buds history, both were sold by the guy who currently owns the pot.