Counter suggestion, since the other suggestor does not want to resuggest.

sold for 12 buds pure:

http://www.tf2outpost.com/trade/21131604

Sold with 16 keys (~1 bud) for a secret noble (13.5) ~ 12 buds (seller's b/o, and shako was offered):

http://www.tf2outpost.com/trade/22499494

http://prntscr.com/4qdm9k

Sold with 7 buds + max's head (3.3) + 2 bmocs (1.1) + prof ks aussie scattergun for a scorching modest (20.5) (outlier):

http://backpack.tf/profiles/76561198093466032?time=1409468400 - before

http://backpack.tf/profiles/76561198093466032?time=1409554800 - after

Sold with 4 buds 8 keys for a hearts pencil pusher (8) + p.fetti rack (4.6) ~ 8.2 buds (outlier):

http://backpack.tf/profiles/76561198033269905?time=1410159600 - after

http://backpack.tf/profiles/76561198033269905?time=1410073200 - before

Given that there are 2 other lower sales, and with the most recent b/o of 12. A flat price of 12 buds seems reasonable.