Judging from the trades on Outpost, it now seems fairly easy to get one of these for 3 ref.

Proof below.

http://backpack.tf/classifieds/search/763/6/0

Classifieds currently have 9 unpainted ones for sale.

5 people are selling for 3 ref, 2 for 3.22 ref, 1 for 3.33 ref and 1 for 3.66 ref.

1 person is selling his Purple-painted one for just 3 ref.

Sellers for 3 ref or less:

http://www.tf2outpost.com/trade/13287041 lowest bp.tf prices

http://www.tf2outpost.com/trade/13066299 sold for 2.66 ref

http://www.tf2outpost.com/trade/13318106 3 ref

http://www.tf2outpost.com/trade/13214267 3 ref, 3 days

http://www.tf2outpost.com/trade/13292451 3 ref, not sure if real

http://www.tf2outpost.com/trade/13215707 3 ref, 3 days

http://www.tf2outpost.com/trade/13308974 3 ref

http://www.tf2outpost.com/trade/13161833 3 ref

http://www.tf2outpost.com/trade/13290473 3 ref

http://www.tf2outpost.com/trade/13186615 3 ref, 4 days

http://www.tf2outpost.com/trade/12728962 3 ref, 2 weeks lol

http://www.tf2outpost.com/trade/13294905 3 ref

Unsolds for 3.11 ref to 3.33 ref:

http://www.tf2outpost.com/trade/13222243 3.22 ref

http://www.tf2outpost.com/trade/13274796 high end bp.tf prices

http://www.tf2outpost.com/trade/13292431 3.33 ref

http://www.tf2outpost.com/trade/13289092 3.33 ref

http://www.tf2outpost.com/trade/13270438 high end bp.tf prices

http://www.tf2outpost.com/trade/13124015 3.33 ref, 'quick trade', 6 days

http://www.tf2outpost.com/trade/13206161 high end bp.tf prices

http://www.tf2outpost.com/trade/12654699 3.33 ref, 2 weeks lol

http://www.tf2outpost.com/trade/13230277 3.33 ref

http://www.tf2outpost.com/trade/13288820 3.33 ref

http://www.tf2outpost.com/trade/13243260 3.33 ref

http://www.tf2outpost.com/trade/13035978 3.33 ref, 1 week

Conclusion: There are about 8 pages of unpainted ones on Outpost, but most have low craft numbers, and many are in sets or going for offers from what I've seen, so it was difficult getting solid proof. However, it looks like it is easy to get this for just 3 ref, hence the removal of the higher end.