2 sellers for 1.55 was the cheapest i found

http://www.tf2outpost.com/trade/8136931 - sold for 2ref, 1 left (old trade)

http://www.tf2outpost.com/trade/8942819 - sold out at 2ref (old trade)

http://www.tf2outpost.com/trade/10045127 - sold out at 2ref

http://www.tf2outpost.com/trade/11306838 - sold for 1.66

http://www.tf2outpost.com/trade/9535718 - sold out at 1.66

http://www.tf2outpost.com/trade/11085504 - sold for 1.66

http://www.tf2outpost.com/trade/9046531 - sold out at 1.66

http://www.tf2outpost.com/trade/10801567 - 1.66 offered, wants 2ref

http://www.tf2outpost.com/trade/10484973 - 1.66 offered, wants 2ref

http://www.tf2outpost.com/trade/11044288 - added for 1.66, no deal

http://www.tf2outpost.com/trade/11230002 - added for 1.66-2.33, no deal yet

http://www.tf2outpost.com/trade/11143569 - 1.44+wep offered, no deal

http://www.tf2outpost.com/trade/11135107 - craft hat offered, no deal

http://www.tf2outpost.com/trade/11270414 - key+1.33ref offered (?)

http://www.tf2outpost.com/trade/11114828 - buying for 1.55, sure he got some but 0 in BP

http://www.tf2outpost.com/trade/9418260 - buying for 1.55, successful, price changed for sure

http://www.tf2outpost.com/trade/11166022 - buying for 1.33, 6days, no success

http://www.tf2outpost.com/trade/11267950 - buying for 1.33, 2days, no success

http://www.tf2outpost.com/trade/11221783 - buying for 1.33, has one

http://www.tf2outpost.com/trade/10282279 - buying for 1.33, 1 month, no success

http://www.tf2outpost.com/trade/10692937 - buying for 1.33, 3weeks, 1 in BP

http://www.tf2outpost.com/trade/10759488 - buying for 1.33, 2weeks, no success

http://www.tf2outpost.com/trade/11221900 - buying for 1.33, 4days, no success

http://www.tf2outpost.com/trade/11198309 - buying for 1.33, 5days, no success

strange things going on, quite many selling for one key, or this:

http://www.tf2outpost.com/trade/9462330 - unsold 8keys