Proof below. 6 month-old price.

Sales:

http://www.tf2outpost.com/trade/18676472

-wanted 2.5 buds

-stahl+12 keys sold for max: http://www.tf2outpost.com/trade/18561329

-~2.2 buds

http://www.tf2outpost.com/trade/18810120

-'quicksold' for 2 buds, took 4 days: http://www.tf2outpost.com/trade/18887077

-bought buds with the keys

-anyway this makes little difference, there are other sales close to this

http://www.tf2outpost.com/trade/17749599

-sold for blizz led+planets hoodie=~2.5 buds

http://www.tf2outpost.com/trade/18352895

-duped, wanted 3 buds

-bought pro sf sniper: http://www.tf2outpost.com/trade/17913046

http://www.tf2outpost.com/trade/17982838

-duped, wanted ~3 buds

-bought c9 sns: http://www.tf2outpost.com/trade/17749021

-~2.4 buds

http://www.tf2outpost.com/trade/17957809

-duped, wanted ~3.2 buds

-seems to have sold for ks toe: http://www.tf2outpost.com/trade/17923565

-~2.1 buds

Current trades:

http://www.tf2outpost.com/trade/14429955

-been up for close to a decade

http://www.tf2outpost.com/trade/19036661

-'quickselling' for 2.15 buds

http://www.tf2outpost.com/trade/18425525

-wants 3 buds

Sales: 2, 2.1, 2.2, 2.5

Sales all seem to fit nicely into a range of 2-2.5.