Proof below. 7 month-old price.

Sales:

http://www.tf2outpost.com/trade/15344497

-b/o of ~10.3 buds

-sold for pe stash=7.4 buds

-notable offers:

ge aa (outdated)+bubbling jefe+stormy berliners+gifted searing marauder (2.75 outdated before overpay)=~7-8 (taking a little off for gifted)

scorching softcap+5 keys=6.5

duped burning milkman=6-7?

kaw swagman (unpriced but terror is 6 before overpay)+c9 snaggle=8.7 outlier

blizz antlers (unpriced)=probably 7-8

stormy 13th honcho+#7 spartan=7?

ge hoodie+45 keys+sweets=6.5

http://www.tf2outpost.com/trade/15286672

-wanted 8-8.5 buds

-buyer originally offered pe reggae+30 keys but he sold his reggae for a pe anger (not in history: http://www.tf2outpost.com/trade/15344455 ) likely with the keys since it's an upgrade, meaning the stash would have sold for just the pe anger (lime hornblower was free)

-seller's bp:

http://backpack.tf/id/76561197995194055?time=1382857200

http://backpack.tf/id/76561197995194055?time=1383030000

-the new 3 buds+71 keys is ~7.2 buds which should be what he sold his anger for, hence the buyer of the stash probably just paid the pe anger

-~7.4 buds

-notable offers:

8 buds (collecting, but wasn't likely at the time since apparently someone was collecting that for his harvest dapper which is quite a bit lower surprisingly)

burning birdcage-1 bud=6.7

burning fuka (offer on the above reggae)+25 keys=7.4

sf medi gun+stormy stahl+stormy guad+spectral bills (already halloween then)+2 buds=8.3

http://www.tf2outpost.com/trade/15267229

-sold for a 7 buds offer within a day

-notable offers:

ghosts fro (outdated)+disco o. ushanka+terror fruit shoot=7.1

http://www.tf2outpost.com/trade/13691268

-finally sold for phos yellow belt (unpriced)+miami titanium tyro+1 bud confirmed here: http://backpack.tf/vote/id/5269387b4cd7b8c7478b4568

-not using this sale but using his valuation of the phos belt (could be low) the sale comes out to be ~8.7 buds, outlier

-recent notable offers:

disco chef hat+2 buds=7.9

dp kabuto+1 bud=6.5

7 buds

scorching hermes=6.6

phos juju (unpriced)+1 bud=6.6 taking sulph price (outdated)

http://www.tf2outpost.com/trade/13269537

-wanted 7 buds, a little old

-sold for 6 buds+11 keys after a month: http://backpack.tf/id/76561198041782772?time=1377586800

-6.5 buds, however this is quite old, recent sales have had no trouble selling for considerably higher

Some current owners:

http://www.tf2outpost.com/trade/14144519

-wanted 8.5 buds, had been up for 2 months

http://www.tf2outpost.com/trade/15605219

-wants 8 buds, 1 month old

-notable offers:

ge tyrants+stormy pug=6.6

burning whoopee+1.5 buds=7.1

7 buds+#7 spartan=max ~7.5

a.f. chef hat (unpriced)=~7?

kaw tyrantium=8.9 outlier

misty tricorne (outdated)=6.8

5 buds+o.f. engi cap, buddy and bonnet=7.6

disco capo+terror o. ushanka (kaw has outdated price of 1.8 before overpay)=7.5

roboactive hwnn-1 bud=6.8

aces bomber+o.f. tyrant=9.7 outler, seems desperate

burning chieftain=6.8

beams spartan+ghosts gridiron (unpriced but ~2)+ 7 keys=7.8

ge tyrants+ge pug=7.2

sulph crown (outdated)+black max=7.5

cloudy chef hat (outdated)-2=6.6

Sales: 6.5, 7, 7.4, 7.4

Anything below 7 is definitely low. 7 isn't exactly a quicksell price though, the notable offers show that they are mostly 7-8, and I'm including this in the range. 8 is definitely the max though, we had one unlikely collecting offer+few offers around there+b/os there. Unusual overpay and original prices used.