kinda big range but its ok

Sale #1: 3.7 buds

http://www.tf2outpost.com/trade/24428256

Sold for an Electrostatic Pyro Slug, 10 keys pure, and 1 bud pure

2.25 * 0.9 = 2 buds

2 + 1.7 = 3.7 buds

Sale #2: 5 buds

http://www.tf2outpost.com/trade/24459252

Sold for a Midnight Whirlwind Battin’ a Thousand + Stormy Storm Armored Authority + Haunted Ghosts Flipped Trilby

1.5 + 1 + 3.1 = 5.6 * 0.9 = 5 buds

Stormy Storm Armored Authority Mini: 1.5 buds

http://backpack.tf/profiles/76561198101596547?time=1418544000

Sold for a Circling TF Logo Ye Olde Baker Boy and added about 5 keys

2.05 * 0.9 = 1.8 buds

1.8 - 5 keys = 1.5 buds

Midnight Whirlwind Mini: 1 bud

http://www.tf2outpost.com/trade/24469592#latest

I bought it for an Orbiting Planets Larrkin Robin

1.15 * 0.9 = 1 bud

Haunted Ghosts Flipped Trilby Mini: 3.1 buds

http://www.tf2outpost.com/trade/23849365

Sold for a Max Head

B/O of 3.1 buds