Proof below. 4 month-old price.

Cleans only, correct me if I'm wrong. The ones on the market should be clean.

Sales:

http://www.tf2outpost.com/trade/15605204

-wanted 9 buds

-sold for 7.5 buds seen here: http://www.tf2outpost.com/trade/16150445

-notable offers:

eerie grimme=7

http://www.tf2outpost.com/trade/15603352

-wanted 9 buds

-bought ge stash (outdated): http://www.tf2outpost.com/trade/15344497

-notable offers:

ge tyrants+voodoo juju on another trade=7

-6 buds but it's terribly outdated, I presume it's much higher around pe now

http://www.tf2outpost.com/trade/15560715

-was quickselling for 7 buds

-seller's bp:

http://backpack.tf/id/76561198044868437?time=1383811200

http://backpack.tf/id/76561198044868437?time=1383897600 2 buds+128 keys in new items (exactly 10 buds)

-he sold the p. fetti stash on the day too for 3 buds: http://www.tf2outpost.com/trade/15523546 , leaving us with 7 buds for the pe stash, sold within a day so it's a quicksell

http://www.tf2outpost.com/trade/16280756

-stash+sf rl (with nice parts) seems to have bought burning tossle: http://www.tf2outpost.com/trade/16149989

-8.5 buds

http://www.tf2outpost.com/trade/15797988

-sold for duped burning milkman+40 keys=roughly ~8 buds?

-notable offers:

7 buds

aces war pig+1 bud=8

ghosts tyrants+1.5 buds=6.7

burning shako+sf rl+15 keys=7.5

http://www.tf2outpost.com/trade/15663639

-b/o of 9 buds

-stash+hearts beret (2.75 outdated) bought clean beams phantom (5.75 outdated and very undervalued): http://www.tf2outpost.com/trade/15540863

-3 buds, clear outlier, buyer said he was overpaying

Current trades:

http://www.tf2outpost.com/trade/16283903

-b/o of 8.8 buds

-notable offers:

sulph crown (outdated)+black max=7.6

secret salty dog=6.8

burning fuka+bmoc=6.7

http://www.tf2outpost.com/trade/14697148

-not considering offers below 8 buds, few months old

-recent notable offers:

flies tyro (outdated)+blizz hallmark+stormy fff (outdated)+steaming lucha+o.f. trophy (outdated)+steaming dixie=8.9

beams aa=6.8

blizz antlers (unpriced)=7+? (kyrann paid 10?)

vivid anger+2 buds+listed sweets=8.4-8.5

flies lid (outdated)+1 bud+listed stuff=8.9

misty lucky shot (outdated)=7.6

vivid hallmark+vivid big chief (never properly priced)+2 buds+s. huntsman+white bills=8.5

7.5 buds+vivid big chief (same as above)+s. huntsman=9.4

ghosts stahl (outdated)=6.8

ks tyrants=7.9

8 buds (he could collect)

ghosts tyrants+4 buds=9.2 (seems to have bought another one: http://www.tf2outpost.com/trade/15336256 )

aces war pig=7

scorching birdcage=7.2

kaw tyrantium=8.9

disco capo+terror officer's ushanka (unpriced)=~7.5?

ghosts stash+2.5 buds=7.2

pe hallmark (outdated)+1 bud=6.9

roboactive hwnn=7.8

cloudy merry-1=6.9

hearts trilby+misty mountain cap (outdated)+stormy cosa=8.4

http://www.tf2outpost.com/trade/15986917

-wants 9-10 buds, 2 weeks

http://www.tf2outpost.com/trade/16150445

http://www.tf2outpost.com/trade/15024453

-nothing below 7

Sales: 3, 6, 7, 7.5, 8, 8.5, 9.2

7 looks like a more of a quicksell price, as proved by the quicksell of 7 buds within a day which is very fast along with a huge amount of offers at 7, pretty much showing 7 is quite low. So I'm setting 7.5 as low end with 9 as the high end with a sale and a few offers around there, pretty much proved 8.5 isn't the limit. There are actually quite a few more different offers on another old trade, I just listed 2 current trades' offers to prove the range. Unusual overpay and original prices used.