Proof for 10 buds:

http://tinypic.com/r/jfxit3/8

Sold on Jan 2, at that time buds were listed at 14-15 Keys.

-Credit to 32BitPimp | Trade Offer Please for finding this proof.

Proof for 8+:

Buyout at 8, sold for 8.3 in Unusuals +20 Keys

http://www.tf2outpost.com/trade/23610222 was about 2 months ago, sold for

-Hearts Samur-eye (~4.75B)

-Haunted Ghosts Whoopee Cap (~2.6B)

-Peace Sign Cowl (~1.9B)

-20 Keys

That is taking mid-range prices on those hats. 4.75+2.6+1.9= 9.25B

9.25*.9= 8.325buds

It sold for 8.3B+20keys.

-Credit to Ѕlocumruls || cryptictra.de for finding the outpost link

Buyout at 8:

http://www.tf2outpost.com/trade/23697818 was about 1 month ago

-Credit to Ѕlocumruls || cryptictra.de for finding the outpost link

There are currently none listed for sale on Outpost, Classifieds, or Bazaar.

Yes, this is my first suggestion. Tips and Criticism are very welcome.