Proof below.

Sales:

http://www.tf2outpost.com/trade/15322776

-wanted around 6 buds

-noir+10 keys+h5, bought this steaming crone's dome (4.75): http://www.tf2outpost.com/trade/14983499

-seen here: http://backpack.tf/id/76561198053200040?time=1382943600

-~4.1 buds

http://www.tf2outpost.com/trade/15097518

-sold for ge napper's=~3.4 buds, a little low, outlier

http://www.tf2outpost.com/trade/14867590

aces antlers (5.15) seems to have sold for noir+electrostatic mullet seen here: http://www.tf2outpost.com/trade/15097518

-buyer not in mullet's history, but I think he did have it: http://www.tf2outpost.com/trade/15079764

-3.8 buds, also seems quite low looking at the many offers and sales above this

http://www.tf2outpost.com/trade/14335571

-b/o of 5 buds

-sold for lime level 1 max's with chromatic (2.17), pink #18 bigg mann on campus with chromatic (0.34), pink eas with chromatic (0.34)+2 buds+~9.25 ref (0.08)

-~4.9 buds (taking spells as 1/4 value advised by polar bear)

-original offer of cc lime level 1 max+o.f. chapeau=~4.2 buds

http://www.tf2outpost.com/trade/13626695

-wanted 4 buds

-seems to have sold for smoking tc=~4.1 buds at the time

-would have accepted 4 pure so this sale is counted as 4 buds

-smoking tc: http://www.tf2outpost.com/trade/13546500

http://www.tf2outpost.com/trade/15324893

-was 'quickselling' for ~4.5 buds

-sold for 4 buds, doesn't look like a quicksell, I have other similar sales too

Current trade:

http://www.tf2outpost.com/trade/13930953

-b/o of 5.5 buds

-offer of ghosts sam-1 bud=5 buds but ghosts sam is very outdated, one guy quickselling for 5 buds

-offer of sulph charmers+keys=more than 4.5 buds at the time

-offer of pe robo birdcage+31 keys=should be 4-5 buds (sulph is 2.8 outdated)

-offer of ge beret+40 keys=~4.8 buds

Sales: 3.4, 3.8, 4, 4, 4.1, 4.9

Low end and high end from both ends of sales. 3.4 seems like an outlier so not included in the range. 3.8 is close enough but there are many offers and sales above so it has not been included. Many offers inside the range (only notable ones listed). Unusual overpay and original prices used.