Thanks to Derpy ( http://backpack.tf/u/76561198101838829 ) for 2 of the sales.

Sale 1:

Sold for a Stormy 13th Hour Defiant Spartan + 19 keys

[(7.5*0.9) + 1.9] = 8.65 rounding to 8.7

http://www.tf2outpost.com/trade/25449652 & http://imgur.com/sgyrAPW

Sale 2:

Sold for a Burning Flames Triboniophorus Tyrannus

(9.2*0.9) = 8.28 rounding to 8.3

http://www.tf2outpost.com/trade/25161646

Before: http://backpack.tf/profiles/76561198089388084?time=1426230000

After: http://backpack.tf/profiles/76561198089388084?time=1426316400

Sale 3:

Sold for an Electrostatic Crones ~10

http://www.tf2outpost.com/trade/25375833 & http://imgur.com/RYdnsBD

or http://www.tf2outpost.com/trade/25435526

(10*0.9) = 9

Notes:

Mini for the Electrostatic Crones

http://www.tf2outpost.com/trade/25292094

1:1 with a Ghastly Ghosts Jr. Tyrant ~11

http://www.tf2outpost.com/trade/25057758

B/O of 10 pure for 1 month

Had a collecting offer for 10 (most likely didn’t work out), also had an offer of a Sunbeams Berliner's Bucket Helm + a Aces High Crone's Dome [(5.36 + 5.65)*0.9] = 9.909

Taking the price as ~10 buds

Conclusion:

Sales at 8.3 and 8.5 and 9, taking the final range at 8.3 to 9.