Proof:

Sellers:

http://www.tf2outpost.com/trade/14430761 - Sold for 2.85

http://www.tf2outpost.com/trade/14269320 - Sold for 2.5

http://www.tf2outpost.com/trade/14479591 - Sold for 2.5

http://www.tf2outpost.com/trade/14507056 - Sold for 12 ref or 2 keys (12 ref is basically 2 keys anyways)

http://www.tf2outpost.com/trade/14485402 - Sold for 2

http://tf2tp.com/trade.php?trade=9791714 - Offered Taunt + 5 keys for Strange Loose Canon (7) which places the Taunt at 2

http://bazaar.tf/trade/429588 - Sold for 2

Buyers:

http://www.tf2outpost.com/trade/14316784 - Had willing sellers at 2.85, 2.66 and 2.5

At the moment of posing Classifieds had 1 for 2.8

Some do manage to sell for 3 (for now)

Out of 3 pages on op about 2 pages were last bumped 2 or more days ago (irrelevant trades)

Since there's only about 1 page (25 trades) that are bumped or at least last bump was less than 1 day ago and out of those trades some try to sell for 3 and some try to sell for more, it's hard to find proof

I know the 2 - 2.5 taunts sold pretty fast but it seems that it's possible to buy for less than 2.8

Extra Proof:

Sellers:

http://www.tf2outpost.com/trade/14512987 - Selling for 2.85

http://tf2deal.ru/trade.php?id=49516 - Selling for a 1.5 item + 1.2 item which means it's 2.7 and it's paid with items

http://tf2tp.com/trade.php?trade=9792091 - Selling for 2.5

http://tf2tp.com/trade.php?trade=9792155 - Sold for 2

http://tf2tp.com/trade.php?trade=9784987 - Kind of old but he still put it for a 2 keys item

Buyers:

http://www.tf2outpost.com/trade/14452847 - Bought for 2.72 (now selling for 2.85, his link is 1st in sellers in this comment)

http://www.tf2outpost.com/trade/14515812 - Buying for 2.66 only 4 views when I saw his trade but lets see how fast he buys

http://www.tf2outpost.com/trade/14316784 (same link as before) - Now has an offer of 2 keys 1 ref (2.166)

Again many trades on outpost aren't bumped and rest are mainly overprices such as over 3 and 4 keys

Extra Proof:

http://www.tf2outpost.com/trade/14542038 - Selling for 2.8

http://www.tf2outpost.com/trade/14537825 - Selling for 2.5

http://www.tf2outpost.com/trade/14539461 - Sold for 2.5

http://www.tf2outpost.com/trade/14535632 - Selling for 3 taunts that worth together ~2.15 and that's in items...

http://www.tf2outpost.com/trade/14527636 - I have proof of him sold for 2 keys, this trade only says sold but I saw also saw it through trade.tf and he listed it there at 2, I'm too lazy to get a screenshot so you can either check or think of this as invalid proof or whatever

http://www.tf2outpost.com/trade/14533576 - Sold for 2

The buyer who wanted 2 and was offering 2.66 has already bought it in less than a day, he had 3 sellers, 1 offered 2.5 in order to get the deal cause he was a bit too late

At the moment of posting this classifieds had 1 at 2.5 and 1 at 2.8