i persoanlly sold many at 3.66 ref and was going soo easy here is one i had more than 1

http://www.tf2outpost.com/trade/17034222

2nd comment said added for axe and is kinda hard to find the trade histories

Here's the pic for my sale 4 ref (the first link) http://puu.sh/6hOhn.png since the outpost history hasn't changed yet. You can see his offer of 4 ref in the comments however.

Some buyers:

http://bazaar.tf/trade/632359 v. modest, 5 ref

http://www.tf2outpost.com/trade/17178354 Brawling buccaneer, 4 ref

http://bazaar.tf/trade/634889 1 key for sight for sore eyes + s. axtinguisher

http://www.tf2outpost.com/trade/17170157 3.33

http://www.tf2outpost.com/trade/17163817 3.33

http://www.tf2outpost.com/trade/17162149 3.33

http://www.tf2outpost.com/trade/17139313 3.33

http://www.tf2outpost.com/trade/17160399 3.44

Just shows that 3.33 may be considered a quicksell if there's so many people willing to buy for market price. Upvoted.

http://www.tf2outpost.com/trade/16122990 willing buyer @ 4.66

http://www.tf2outpost.com/trade/17156143 seller 3.66 (even has part on it) added this guy and he said he sold out and fast

http://www.tf2outpost.com/trade/17009449 willing buyers at 4ref

Proof supports this range, upvote!

Whenever I get hold of these they sell super quick at 3.66

Oh god, get a Killstreak for it will be difficult

Meh, decently proof, but really good extra-proof from the users. That does me upvote!