Sold for Kill-a-Watt Buccaneer's Bicorne (2) + Circling TF Logo Larrikin Robin (1) + Strange Killstreak Machina (1)+ 10 keys (.6):

http://backpack.tf/profiles/76561198044085776?time=1420576435

http://backpack.tf/profiles/76561198044085776?time=1420617600

(2 + 1 +1) * .9 + .6 = 4.2 buds

Sold for Misty Skull Dead Cone (2.7) + The B.M.O.C. (.55):

http://backpack.tf/profiles/76561198047651268?time=1421395200

http://backpack.tf/profiles/76561198047651268?time=1421389435

(2.7 + .55) * .9 = 2.925 buds

Rounded to 2.9 buds

Another sale in http://backpack.tf/vote/id/54bcb07eb88d883b3a8b4d81 should support Misty Dead Cone's price.

Outlier.

Sold for Kill-a-Watt Whoopee Cap (2.33) + Steaming Front Runner (1.8):

http://backpack.tf/profiles/76561198042040074?time=1422086400

http://backpack.tf/profiles/76561198042040074?time=1422000000

(2.33 + 1.8) * .9 = 3.717 buds

Rounded to 3.7 buds

KaW Whoopee mini:

http://www.tf2outpost.com/trade/24965987

Sold for Power Surge Your Worst Nightmare (4) + 1 key (.07):

http://backpack.tf/profiles/76561198108784642?time=1421654400

http://backpack.tf/profiles/76561198108784642?time=1421568000

4 * .9 + .07 = 3.67 buds

Rounded to 3.7 buds

Mini for PS YWN:

Seller is young, but should be fine here.

Sold for 4 buds + 3 keys (3/14):

http://backpack.tf/profiles/76561198042040074?time=1422086400

http://backpack.tf/profiles/76561198042040074?time=1422216828

4.2 buds

Seller at 4 buds:

http://www.tf2outpost.com/trade/24970901