Sale 1:

Sold for Duped Scorching Desert Marauder* (9*0.9) = 8.1

http://www.tf2outpost.com/trade/24052886

Sale 2: (invalid sale, way too complex)

Huge deal involving Frostbite Woodsman (http://backpack.tf/item/3289381758), Holy Grail Schadenfreude, and Morning Glory Swagmans

http://www.tf2outpost.com/trade/24085794

Sale 3:

Sold for G.Fetti Muffs (7.65*0.9) + 1 bud + DaD Doctor's Sack (3.65*0.9) = 6.89 + 1 + 3.29 = 11.18 (rounding to 11.1)

http://backpack.tf/profiles/76561198054862332?time=1419840000

Sale 4:

Sold for 7 buds + 11 keys (11/14.5) = 7 + 0.76 = 7.76 (rounding to 7.8)

http://www.tf2outpost.com/trade/24456471

Mini for Scorching Desert Marauder*:

http://www.tf2outpost.com/trade/23066780 - Offer of 10 buds in unusuals

http://www.tf2outpost.com/trade/23066780 - Offer of 5 buds + 1 gifted bud + 50 keys = ~9 pure

http://www.tf2outpost.com/trade/24070777 - B/O of 9 buds

~Valuing this at 9 buds.

Notes:

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

This Frostbite Luchadore is a 1 of 1 cosmetic and there has only been 4 recent sales before landing it's way to a "collector", wouldn't be put back on the market for quite a while.

http://www.tf2outpost.com/trade/24052886 - Offer of Duped Burning Le Party Phantom = ~8

http://www.tf2outpost.com/trade/24456471 - B/O of 8 buds

Conclusion:

Sales at 8.1, 11.1, 7.8, a B/O of 8 and an offer of ~8. Due to this, I'm calling Sale 2 an outlier. Thus, taking a final range ot 7.8-8.1 buds.

Feel free to support/counter my suggestion!

(requested by polar, credits to him for providing the sales)