Sellers below 2keys -

http://www.tf2outpost.com/trade/15114327 - 1.35keys

http://www.tf2outpost.com/trade/15105864 - 1.5keys

http://www.tf2outpost.com/trade/15101166 - 1.5keys

http://www.tf2outpost.com/trade/15087875 - 1.5keys

http://www.tf2outpost.com/trade/15088932 - 1.5keys

http://www.tf2outpost.com/trade/15091669 - 1.5keys

http://www.tf2outpost.com/trade/15079432 - 1.5keys (S Widowmaker = ~1.5)

http://www.tf2outpost.com/trade/15113384 - 1.6keys

http://www.tf2outpost.com/trade/15083153 - 1.7keys (painted)

http://www.tf2outpost.com/trade/15113293 - 1.7keys

http://bazaar.tf/trade/486510 - 1.7keys

http://www.tf2outpost.com/trade/15117687 - 1.7keys

http://www.tf2outpost.com/trade/15086753 - 1.7keys

http://www.tf2outpost.com/trade/15103774 - 1.7keys

http://www.tf2outpost.com/trade/15093175 - 1.7keys

http://www.tf2outpost.com/trade/15116358 - 1.7keys

http://www.tf2outpost.com/trade/15116299 - 1.7keys

http://www.tf2outpost.com/trade/15115901 - 1.7keys

http://www.tf2outpost.com/trade/15118315 - 1.7keys

http://www.tf2outpost.com/trade/15106239 - 1.7keys

http://www.tf2outpost.com/trade/15098446 - 1.7keys

http://www.tf2outpost.com/trade/15103287 - 1.75keys

http://www.tf2outpost.com/trade/15104341 - 1.8keys

http://www.tf2outpost.com/trade/15114426 - 1.8keys

http://www.tf2outpost.com/trade/15115163 - 1.8keys

1.65 = 10ref

But that range is insanely ugly, 1.7 looks more clean. But whatever 1.7keys (1.65 actually) is being sold a lot.