Overpay/original prices used

http://www.tf2outpost.com/trade/17061256 - Sold w/ Prof. Australium Black Box ($126, or 3.1) for C9 Hoodie (4.2) + MN Yellow Belt (3.2) + 70 keys (3.5 buds) = 7.8 buds outlier

http://www.tf2outpost.com/trade/16948468 - Sold for Cloudy Moon Yellow Belt = 7.0 buds

http://www.tf2outpost.com/trade/12372767 - Sold for Blizz Executioner (5) + 1.5 buds = 6.5 buds

http://www.tf2outpost.com/trade/16820102 - Sold for $150 (3.5 buds??)

Other Links:

http://www.tf2outpost.com/trade/17756582 - Sold + 1.5 buds for Scorching Tree (old price, 5.1) = 6.6 buds

http://www.tf2outpost.com/trade/17585135 - Sold for Green Black Hole Nickel (old price, 5.7) + 14 keys (0.7) = 6.4 buds

For Black Box price I took the eight Strange Professional Australium Black Boxes sold in the last 30 days on the Steam Market and averaged their price, then converted that to buds.

Obviously, price fluctuates based on Killstreakifier and Sheen, so I'm not using that link. It seems to be an outlier compared to others anyway.