Unslods at 20 ref:

http://www.tf2outpost.com/trade/25633749

http://www.tf2outpost.com/trade/25641083

http://www.tf2outpost.com/trade/25643025

http://www.tf2outpost.com/trade/25645443

http://www.tf2outpost.com/trade/25626875 (with paint)

http://www.tf2outpost.com/trade/25599372

http://www.tf2outpost.com/trade/25643620

http://www.tf2outpost.com/trade/25628162

http://www.tf2outpost.com/trade/25625409

http://www.tf2outpost.com/trade/25645348

http://www.tf2outpost.com/trade/25640079

http://www.tf2outpost.com/trade/25618620

http://www.tf2outpost.com/trade/25634443

http://www.tf2outpost.com/trade/25644689

http://www.tf2outpost.com/trade/25637664

http://www.tf2outpost.com/trade/25603675

http://www.tf2outpost.com/trade/25635031

http://www.tf2outpost.com/trade/25616145

Sellers at 19 ref:

http://www.tf2outpost.com/trade/25539648

Sales at 19 ref:

http://www.tf2outpost.com/trade/25627524

Sellers for 18 ref:

http://www.tf2outpost.com/trade/25641634

http://www.tf2outpost.com/trade/25635361 (18 ref or 1 key) No anyone will pay 1 key

http://www.tf2outpost.com/trade/25645315

http://www.tf2outpost.com/trade/25632821

http://www.tf2outpost.com/trade/25629459

Seller for 17.88 ref:

http://www.tf2outpost.com/trade/25643837

Sellers for 17 ref:

http://www.tf2outpost.com/trade/25635904 (1 normal for 17 ref and one painted for same price)

http://www.tf2outpost.com/trade/25634304

1 key=20 ref

Constructive criticism is good!

If you have more proof, put it in comments, that will help me!

Let it GO!

And at final the classifields!: http://backpack.tf/classifieds/?item=Sub%20Zero%20Suit&quality=6&tradable=1&craftable=1

1X 16 ref

1X 16.33 ref

2X 17 ref

7X 18 ref

1X 18.33 ref

1X 18.66 ref

5X 19 ref

Mid range is 18 ref!