Proof:

Sellers:

http://www.tf2outpost.com/trade/11358355 - Had an offer of 3.66 in less than a day, buyer bought from someone else though, unknown price

http://www.tf2outpost.com/trade/11463017 - Has an offer of 3 hats, 2 craftable (easy 1.33) and Uncraftable Executioner (1 – 1.33) which makes the offer 3.66 – 4

http://www.tf2outpost.com/trade/10976430 - Had offers of 3.33, 3.66 and a retracted offer of 4

http://www.tf2outpost.com/trade/11343890 - Sold out for 3.66 and had an offer of Clean TC for 1 which is almost a key

http://www.tf2outpost.com/trade/10553130 - Someone wrote added for 1 key

http://www.tf2outpost.com/trade/10223123 - Someone wrote added for 1 key and someone offered 2 robo keys for Revolver and Dead Ringer which means it's about 1 key for Revolver

http://www.tf2outpost.com/trade/10110956 - Just like the above, 1 key for Revolver and 2 robo keys for Revolver and Dead Ringer

http://www.tf2outpost.com/trade/11500131 - He sold for 3.66 in less than a day

Buyers:

http://www.tf2outpost.com/trade/11495353 - Only 1 day and he's buying for 3.22 instead of 3.33 but that's 1 scrap difference, and lets keep an eye on this if suggestion takes long

http://www.tf2outpost.com/trade/11514846 - New, lets keep an eye

http://www.tf2outpost.com/trade/10564370 - Bought 2 for 3.33 yesterday, no other adds for up to 2 weeks and price was changed last week

Out of less than 4 pages of sellers, at least 1 page is Revolvers in sets or with strange parts attached

Only 2 in Classifieds, 1 for 3.66 and 1 for 4.66 (with snipers killed on it)

Buyers are mostly trying to buy for less than 3 so I added all I could find that is 3.33

3.33 sellers are striving to 0 and above 3.66 is also possible, some sell for a key