Lots of ppl offering at 1.33 ref are unsuccessful and those selling at 1.66 ref seems to be selling them quickly:

Selling for 1.33 ref:

http://www.tf2outpost.com/trade/9501262 (inactive, shitload of adds)

Sold instantly at 1.33 ref:

http://www.tf2outpost.com/trade/9469822 (3 adds)

Sold at 1.66 ref:

http://www.tf2outpost.com/trade/9365829

http://www.tf2outpost.com/trade/9544759

Being offered 1.33 ref:

http://www.tf2outpost.com/trade/9575996

Being offered 1.44 ref:

http://www.tf2outpost.com/trade/9495347

Being offered 1.55 ref:

http://www.tf2outpost.com/trade/9012266 (trader is not even selling)

Being offered 1.66 ref:

http://www.tf2outpost.com/trade/8938554

Being offered 2 ref:

http://www.tf2outpost.com/trade/9565509

Being offered 2 ref 1 scrap:

http://www.tf2outpost.com/trade/9400240