http://backpack.tf/classifieds/search/id/520069abba25361b48000012 (1 at 3 ref, 1 at 3.22 ref, 9 at 3.33 ref, 5 at 3.66 ref)

http://www.tf2outpost.com/trade/14077382 (3 ref selling 15)

http://www.tf2outpost.com/trade/14204953 (3 ref) Roller

http://www.tf2outpost.com/trade/14035743 (3.11 ref sold)

http://www.tf2outpost.com/trade/14184046 (3.22 ref, 1 day)

http://www.tf2outpost.com/trade/14007990 (3.33 ref, 1 week)

http://www.tf2outpost.com/trade/14164912 (3.33 ref, 1 day)

http://www.tf2outpost.com/trade/14174065 (3.33 ref, 1 day)

http://www.tf2outpost.com/trade/14172457 (3.33 ref sold 1, 2 left)

http://www.tf2outpost.com/trade/14172378 (3.33 ref willing buyer)

http://www.tf2outpost.com/trade/14189577 (3.33 ref sold)

http://www.tf2outpost.com/trade/14193689 (3.33 ref new)

http://www.tf2outpost.com/trade/14193689 (3.33 ref new)

http://www.tf2outpost.com/trade/12792234 (3.44 ref, 1 month)

http://www.tf2outpost.com/trade/14067230 (3.44 ref, 5 days)

http://www.tf2outpost.com/trade/14192552 (3.44 ref new)

http://www.tf2outpost.com/trade/14133787 (3.55 ref, 3 days)

http://www.tf2outpost.com/trade/12956533 (3.66 ref, 3 weeks)

http://www.tf2outpost.com/trade/13819534 (3.66 ref, 1 week)

http://www.tf2outpost.com/trade/13987625 (3.66 ref, 1 week)

http://www.tf2outpost.com/trade/14132743 (3.66 ref, 3 days)

http://www.tf2outpost.com/trade/14151635 (3.66 ref, 2 days)

http://www.tf2outpost.com/trade/14180682 (3.66 ref sold)

3 ref seems as rare as 3.66 ref. 3.33 ref represents the market.