I'm helping someone with their suggestion by updating this :)

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Sale 1: Sold for a Smoking Party Phantom(1.85)+Strange Festive Ambrassador(0.45 buds)

Buyer's bp before:

http://backpack.tf/profiles/76561198080612857?time=1423123200

Buyer's bp after:

http://backpack.tf/profiles/76561198080612857?time=1423209600

Phantom history: http://backpack.tf/item/1013571388

Ambrassador history: http://backpack.tf/item/1333115636

Nano history: http://backpack.tf/item/1650850599

1.85+0.45=2.3

2.3*0.9=2.07 rounding up to 2.1

High end is 2.1 buds

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Sale 2: Sold for a Smoking Charmer's Chapeau(1.5 according to mini)

Buyer's bp before:

http://backpack.tf/profiles/76561198093377668?time=1424332800

Buyer's bp after:

http://backpack.tf/profiles/76561198093377668?time=1424419200

Charmer history: http://backpack.tf/item/795903855

Nano history: http://backpack.tf/item/1650850599

1.5*0.9=1.35 rounding up to 1.4

Low end is 1.4 buds

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Minis

Smoking Chapeau:

http://www.tf2outpost.com/trade/25378427 15 keys

http://www.tf2outpost.com/trade/25387024 15 keys

15 keys=1.5 buds

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If I did anything wrong, please let me know :D