Proof:

Classifieds:

http://backpack.tf/classifieds/search/id/525734554dd7b8737e8b4567 (1 at 3.33, 1 at 3.44, lots at 3.66, lots at 4 ref)

Outpost:

Unsolds:

4 ref:

http://www.tf2outpost.com/trade/15237206 (<1 day)

http://www.tf2outpost.com/trade/15234724 (<1 day)

http://www.tf2outpost.com/trade/15224376 (1 day)

http://www.tf2outpost.com/trade/15240972 (<1 hour)

http://www.tf2outpost.com/trade/15234223 (<1 day)

http://www.tf2outpost.com/trade/15184045 (3 days)

http://www.tf2outpost.com/trade/15231200 (<1 day)

http://www.tf2outpost.com/trade/15201727 (2 days)

http://www.tf2outpost.com/trade/15188021 (3 days)

http://www.tf2outpost.com/trade/15212804 (1 day)

http://www.tf2outpost.com/trade/15202674 (2 days)

Selling:

3.66 ref:

http://www.tf2outpost.com/trade/15240606 (<1 hour)

http://www.tf2outpost.com/trade/15220259 (1 day)

http://www.tf2outpost.com/trade/15116928 (5 days)

http://www.tf2outpost.com/trade/15238444 (<1 day)

http://www.tf2outpost.com/trade/15240848 (<1 hour)

3.55 ref:

http://www.tf2outpost.com/trade/15161323 (4 days)

3.44 ref:

http://www.tf2outpost.com/trade/15211704 (1 day)

3 ref:

http://www.tf2outpost.com/trade/15240965 (<1 hour)

http://www.tf2outpost.com/trade/15229814 (<1 day)

4 ref isn't really viable anymore. 3.66 is common and lots of sellers below aswell.

Thanks for voting : )