There were 3 on the market recently and they all declined 4 buds, which is more than the maximum price listed here. The price was last updated 5 months ago and this item needs a bump. The suggestion I saw here yesterday was too high (there's no sales or offers at 5 buds), but this could definitely use a modest increase.

I sold one for 3 buds + 28 keys yesterday (4.33 buds), so this is in the range.

Proof of sale: http://i.imgur.com/pzoenPf.png

Here are links to the trades:

http://www.tf2outpost.com/trade/13804094

http://www.tf2outpost.com/trade/12661064

http://www.tf2outpost.com/trade/13994046

Notable recent non-pure offers on them in these links which do or could exceed 4 buds:

Vivid Mullet (1.8) + Sunbeams Backbiter's Billycock (2.7): 4.5, after unusual overpay 4.05

Smoking Antlers (no price yet) + Stormy Storm Napper's Respite (1.5): not sure what this is worth.

The recent sale and offer makes the range of 4.0-4.3, after rounding, a reasonable price bump at the moment.

This is my first legitimate suggestion and I'm always open to criticism.

Note that I originally entered the range of 4.0-4.3 buds, but the drop in the price of buds automatically raised it to 4.0-4.4 buds.