http://backpack.tf/classifieds/search/id/52d1c3534cd7b874098b4568/3

2 for 2 buds, 1 for 2.2, 4 for 3 buds.

Sales

http://www.tf2outpost.com/trade/16425662 - Spec. Aus Sniper + SF Grenade, 3 buds

http://www.tf2outpost.com/trade/16937386 - Australium Scattergun, 2.5 buds

http://www.tf2outpost.com/trade/16918179 - Added a Steaming Fez for a Miami L'Inspecteur, 2 buds

http://www.tf2outpost.com/trade/16614985 - Australium Knife, 2 buds

http://www.tf2outpost.com/trade/16528157 - 2 buds pure

http://www.tf2outpost.com/trade/17139254 - Ghosts Rack, 2 buds

http://www.tf2outpost.com/trade/17188716 - 1.5 buds

Selling

http://www.tf2outpost.com/trade/16963046 - Offered 2 pure

http://www.tf2outpost.com/trade/17194686 - Selling for 2 buds

http://www.tf2outpost.com/trade/16463975 - Offered 2 pure

http://www.tf2outpost.com/trade/17005418 - Offered 2 pure

http://www.tf2outpost.com/trade/17142765 - Selling for 2.3

http://www.tf2outpost.com/trade/16812224 - Offered 2 buds + "sweets" (paints - value unknown)

http://www.tf2outpost.com/trade/17171797 - Selling for 2

With hardly any offers/sales above 2 and some buyouts at that, anything above 2 buds has no place. Also, 2 buds flat is the most common price point for all sales. There doesn't seem to be much success at buying lower, either, mostly because of the several willing 2 pure offers.