Well, counter-suggestion because 1 Key is quicksold and don't should be in the range

http://www.tf2outpost.com/trade/16538714 - 1.0~ (in items)

http://www.tf2outpost.com/trade/16533741 - 1.0

http://www.tf2outpost.com/trade/16540869 - 1.0

http://www.tf2outpost.com/trade/16535236 - 1.0

http://www.tf2outpost.com/trade/16541836 - 1.0

http://www.tf2outpost.com/trade/16563151 - 1.0

http://www.tf2outpost.com/trade/16532475 - 1.0 (reduced from 1.15~)

http://www.tf2outpost.com/trade/16571052 - 1.2~ (in items)

http://www.tf2outpost.com/trade/16563928 - 1.2~

http://www.tf2outpost.com/trade/16519159 - 1.2~

http://www.tf2outpost.com/trade/16508456 - 1.2~

http://www.tf2outpost.com/trade/16548690 - 1.3~

http://www.tf2outpost.com/trade/16487841 - 1.3~

http://www.tf2outpost.com/trade/16541049 - 1.3~

http://www.tf2outpost.com/trade/16532819 - 1.3~

http://www.tf2outpost.com/trade/16549186 - 1.3~

http://www.tf2outpost.com/trade/16560393 - 1.3~

http://www.tf2outpost.com/trade/16571170 - 1.3~

http://www.tf2outpost.com/trade/16540106 - 1.3~ (reduced from 1.5)

http://www.tf2outpost.com/trade/16571522 - 1.3~

http://www.tf2outpost.com/trade/16543133 - 1.3~

http://www.tf2outpost.com/trade/16528065 - 1.3~

http://www.tf2outpost.com/trade/16528024 - 1.3~

http://www.tf2outpost.com/trade/16525784 - 1.3~

http://www.tf2outpost.com/trade/16526105 - 1.35~

http://www.tf2outpost.com/trade/16517165 - 1.35~

http://www.tf2outpost.com/trade/16537021 - 1.4, unsold 2 days.

http://www.tf2outpost.com/trade/16575433 - 1.4, Sold for 1.2: http://www.tf2outpost.com/trade/15537471

This need a drop, but 1 Key sells really really fast.

Note: All the proof was taked from the other suggestion and all the credit is for d0.