Just noticed a lot are going for 40 keys (~2.2)

http://backpack.tf/classifieds/search/id/52000301ba25361f15000005 - 4 for 2.2 (non-duped)

39 keys sellers

http://www.tf2outpost.com/trade/16347031

2.2 sellers

http://www.tf2outpost.com/trade/15971261 - sold 2, selling 1

http://www.tf2outpost.com/trade/16274421 - selling 3, 2 painted, sold 4

http://www.tf2outpost.com/trade/16349604

http://www.tf2outpost.com/trade/16340858 - painted

http://www.tf2outpost.com/trade/16335592 - painted

http://www.tf2outpost.com/trade/16284667 - painted

http://www.tf2outpost.com/trade/16313885

http://www.tf2outpost.com/trade/16330211 - willing to take 40 keys (2.2)

2.2 sales

http://bazaar.tf/trade/575661

http://www.tf2outpost.com/trade/16318154 - willing to take 38 keys

http://www.tf2outpost.com/trade/16332787

http://bazaar.tf/trade/580467

http://www.tf2outpost.com/trade/16326274

http://www.tf2outpost.com/trade/16274927

2.3 sellers

http://www.tf2outpost.com/trade/16341872

http://www.tf2outpost.com/trade/16336604

http://www.tf2outpost.com/trade/16314456 - painted

http://www.tf2outpost.com/trade/16334421 - painted

http://www.tf2outpost.com/trade/16298203 - painted, 2 days

2.3 sales

http://www.tf2outpost.com/trade/16281983

http://www.tf2outpost.com/trade/16292062

http://www.tf2outpost.com/trade/16278852

Feel free to counter / support my proof. Vote based on proof presented, not blindly!