1 of 2, none on the market.

Overpay is applied.

http://www.tf2outpost.com/trade/11514321

Sold for a Power Surge Attendant (~3.2 buds)

http://www.tf2outpost.com/trade/12676929

Sold for a gifted Dead Presidents Frenchman's Beret (~2.2 buds) and a Vintage BIll's Hat (~1.9 buds)

~4.1 buds

http://www.tf2outpost.com/trade/12994849

Sold for an O. Planets Private Eye (~1.1 buds), an O. Fire Ballcap (~1.6 buds) and a Sunbeams Festive Tree (~4.4 buds)

~7.1 buds - outlier

Since there are only 3 known sales, one is an outlier, and these are not on the market anymore, it's safer to ignore the outlier.