8 month old price.

http://www.tf2outpost.com/trade/19815299

Sold for an Overclocked Noble Amassment of Hats + 2 buds

3.4 buds w/ overpay

http://www.tf2outpost.com/trade/18685121

Sold for 3 buds in keys

http://www.tf2outpost.com/trade/20370285

http://steamcommunity.com/market/listings/730/%E2%98%85%20M9%20Bayonet%20%7C%20Safari%20Mesh%20%28Minimal%20Wear%29

Sold for a ★ M9 Bayonet | Safari Mesh (Minimal Wear) + 8-10 keys (seller traded too much to accurately see bp history)

The Bayonet sold for $101.20, $99.43, and $101.43, so it sold for an average of $101.60, which is bout 42 keys (2.6 buds)

2.3 + .5/.6 = 2.8/2.9 buds w/ overpay

Radiated Banana made a suggestion for the Oveclocked Noble:

http://backpack.tf/vote/id/53a42c084cd7b8bf4a8b48be

Rounding the range up to 3-3.4 buds.