Proof below. 7 month-old price.

Sales:

http://www.tf2outpost.com/trade/16077954

-wanted 2 buds on another trade

-beret+sf amby (has parts)+black dirty rogue's+s. knife bought level 1 max: http://www.tf2outpost.com/trade/16125716 (clean but people do care about it)

-~1.5 buds, valuing the max a few keys less

http://www.tf2outpost.com/trade/16065957

-wanted 2 buds

-seems to have sold for ts v. bills+ton of sweets seen here: http://www.tf2outpost.com/user/76561198075313894

-~1.8 buds

http://www.tf2outpost.com/trade/14978406

-wanted ~1.9 buds

-sold for 27 keys=~1.7 buds seen here: http://www.tf2outpost.com/trade/15574963

http://www.tf2outpost.com/trade/15576452

-wanted ~2.1 buds

-sold for 1 bud+12 keys=~1.8 buds (sold the bud for 16 keys so there's no bud in bp history)

http://backpack.tf/id/76561198069265267?time=1383984000

http://backpack.tf/id/76561198069265267?time=1384070400

http://www.tf2outpost.com/trade/14558294

-wanted ~2.1 buds

-beret+bubbling grimme sold for g. fetti tower: http://www.tf2outpost.com/trade/15434027

-1 bud, outlier

http://www.tf2outpost.com/trade/14559439

-wanted 2 buds

-sold for nnb exe=~1.8 buds

http://www.tf2outpost.com/trade/16045380

-b/o of 2 buds

-beret+steaming phantom+hearts mullet ( http://www.tf2outpost.com/trade/16033494 ) sold/bought for o.f. modest scrap (outdated)=~1.5 buds

-modest: http://www.tf2outpost.com/trade/15384193

http://www.tf2outpost.com/trade/15926344

-beret+3 keys sold for o.f. beret+o.f. beanie=~1.9 buds

Current trades:

http://www.tf2outpost.com/trade/16126641

-b/o of 2 buds

http://www.tf2outpost.com/trade/15756556

-has offer of 2 buds after a week, looks a little a bit high to be in range seeing as most b/os are around 2 or less and people are willing to settle for less (anyway no difference between 1.9 and 2)

http://www.tf2outpost.com/trade/16018593

-wants 3 buds

http://www.tf2outpost.com/trade/16075128

-wants 2 buds

Sales: 1, 1.5, 1.5, 1.7, 1.8, 1.8, 1.8, 1.9

Low end comes from 2 sales at 1.5, and high end from a sale at 1.9. I don't think 2 belongs in the range, there are many b/os of 2 as seen from the above trades, some are unsold and most settled for less. Unusual overpay and original prices used.