need to update this for another suggestion!

Sale 1:

Sold for Bubbling Soldier's Stash* (3*0.9) = 2.7

http://www.tf2outpost.com/trade/24814396

Sale 2:

Sold with ~1 key sweets (1/14) for Peace Tyrolean* (2.2*0.9)+ Australium Blutsauger ([11/14]*0.9)

X + 0.07 = 1.98 + 0.71

X = 2.62 (rounding to 2.6)

http://www.tf2outpost.com/trade/24610815

http://backpack.tf/profiles/76561198138543395?time=1422000000

Mini for Bubbling Soldier's Stash*:

http://www.tf2outpost.com/trade/24867326 - B/O of 3 buds

http://www.tf2outpost.com/trade/24757710 - B/O of 3 buds

http://www.tf2outpost.com/trade/24757710 - Sold for Steaming TC (~3.4 but B/O was 3 buds, takin 3 buds)

~Valuing this at 3 buds.

Mini for Peace Tyrolean*:

http://www.tf2outpost.com/trade/24510962 - Sold with Peace Trophy Belt (~2.3) + 1 bud for GE Tyrolean (~5.5) = ~2.2

http://www.tf2outpost.com/trade/24510962 - Offer of DBD Whoopee Cap (2.45*0.9) = ~2.2

http://www.tf2outpost.com/trade/24699718 - B/O of 2.2 buds

http://www.tf2outpost.com/trade/24699718 - Rejected an offer of 2 buds

http://www.tf2outpost.com/trade/24870854 - B/O of 30 keys (30/13) = ~2.3

~Valuing this at 2.2 buds.

Notes:

For valuing the buds, I'm using the price at the time of sale.

There were barely any tracable sales for this particular hat...

http://i.imgur.com/wosdG4U.png - Confirmation for Sale 2

Conclusion:

Sales at 2.6 and 2.7. Taking a final range of 2.6-2.7 buds.

Feel free to support/counter my suggestion!