Resuggesting, after discussing with the GREAT NecroTed.

Overpay has been calculated.

Sales

http://backpack.tf/profiles/76561198056917718?time=1397977200 - http://backpack.tf/profiles/76561198056917718?time=1398063600

C9 Bicorne = 1.9 buds

http://backpack.tf/profiles/76561198089549243?time=1398409200 - http://backpack.tf/profiles/76561198089549243?time=1398495600

Aussie Minigun = 1.7 buds

http://www.tf2outpost.com/trade/19388866 - I sold mine for 1.7 buds

http://backpack.tf/profiles/76561198073714706?time=1398409200 - http://backpack.tf/profiles/76561198073714706?time=1398495600

Electrostatic Titanium = 2.8 buds (outlier)

http://www.tf2outpost.com/trade/18210989 - 2.8 buds B/O (2 months)

Other classifieds- http://www.tf2outpost.com/trade/18210989 - 1 month hasn't sold with only 1 offer- which doesn't have a price.

Thanks, I think this is the first viable suggestion i'm making. Credits for Necroted to let me use some of his proof.