This item seems to be pretty rare right now but I think it would be great to give it a base price.

I also encountered few quickbuyers at 5 ref on strangifiers giving it fair 1 key amount.

Bought mine with black paint for almost 2 key too.

Sold @ 1 key

http://www.tf2outpost.com/trade/19220729

http://www.tf2outpost.com/trade/19074327

Sold @ 1 key 1 ref

http://www.tf2outpost.com/trade/19217803

http://www.tf2outpost.com/trade/19515648 (Gold Painted)

Sold @ 1 key 3 ref

http://www.tf2outpost.com/trade/19528117

Sold @ 2 key

http://www.tf2outpost.com/trade/19054524 (3 weeks old)

Strangifiers sold:

http://www.tf2outpost.com/trade/19314200 (Surprising 3 ref)

http://www.tf2outpost.com/trade/18983095 (Sold at 1 key)

Unsold @ 1 key

http://www.tf2outpost.com/trade/19490151 (No bump)

2 Unsolds @ 1 key 1 ref

http://backpack.tf/classifieds/search/id/533eb6d54cd7b88f468b498d

Unsolds @ 1 key 2 ref

http://www.tf2outpost.com/trade/19394200

Unsolds @ 1 key 4 ref

http://www.tf2outpost.com/trade/19473030

http://www.tf2outpost.com/trade/19420351

Unsold @ 1 key 3.66 ref

http://www.tf2outpost.com/trade/19531347

Unsolds @ 2 key

http://www.tf2outpost.com/trade/19192267

Also suggest/advice this is my first suggestion too.