Resuggesting. 11.5 is slightly low. Credits to Liddo for pointing that out.

Sold for 14 buds:

http://www.tf2outpost.com/trade/22915419

Sold for 14 buds:

http://www.tf2outpost.com/trade/22958857

Sold for 10 buds + misty Gym rat (2) ~ 12 buds:

http://www.tf2outpost.com/trade/23187830

Sold with burning spartan (5.9) for secret stash (20) ~ 14 buds:

http://www.tf2outpost.com/trade/22788216

Sold for PE Tyrannus + Ghosts Charmers + 3 buds ~ 11.5 buds (4 days, seller's B/O) taking this as an outlier due to higher sale value:

http://www.tf2outpost.com/trade/23258034

Sold for Blizz TC (4.3) + BLizz Bomber (5.4) + SF rocket (1.6) + SF Sticky (0.9) + SF Grenade (0.3) ~ 12.5 buds:

http://www.tf2outpost.com/trade/22921294

Mini for bomber:

Sold for Lvl 23 Max and a Burning Mullet ~ 6 buds (seller's B/O):

http://www.tf2outpost.com/trade/22445250