...Eh

I couldn't find other non-bulk sales.

Sale 1

http://www.tf2outpost.com/trade/24630690 Sold for Blizz Escorter

Billy had no trade, presuming offered

X = 13*0.9

X = 12

Escorter http://backpack.tf/item/1725602444

Billy http://backpack.tf/item/2526910514

Sale 2

http://www.tf2outpost.com/trade/24333445 Sold for OF Billycock

B/O for Base Metal was 15 keys (1.2)

OF Billy had no trade, presuming offered

X = 13*0.9 keys

X = 12 keys

Billycock http://backpack.tf/item/832762311

Base Metal http://backpack.tf/item/2526910514

Mini for Escorter Credits to Julia

Blizz Escorter sold for Bubbling Cheiftain's Challenge (0.95)

Seller's inventory:

http://backpack.tf/profiles/76561198072803119?time=1421654400 -> http://backpack.tf/profiles/76561198072803119?time=1421740800

0.95 * 0.9 = 0.855

Rounds to ~0.9 buds

0.9 Buds (13 keys)