Changing price to 1 key pure. It's an easy sell for 1 key.

http://www.tf2outpost.com/trade/8442838 sold a few for 1 key

http://www.tf2outpost.com/trade/6809756 charging 2 keys

http://www.tf2outpost.com/trade/8457659 sold out at 1 key each

http://www.tf2outpost.com/trade/5493970 sold a ton of them for a key and ref each

http://www.tf2outpost.com/trade/8472390 sold for a key

http://www.tf2outpost.com/trade/8179101 refusing to sell for less than a key and ref

Only 3 pages roughly on Outpost, with the third page being pretty short. Factor in that a lot of people either are expecting 1 key and 2 ref for their part, are only selling as strange part sets (one guy technically), or don't respond, this seems to be a very good price, as it's rare to see people sell for any less than a key.

Please don't start a flame war in the comments.