Cannot get these at 0.66 anymore. Every seller is looking for at least a ref, and it's the ones around there that are selling.

Sold for 1 ref:

http://www.tf2outpost.com/trade/6693571 - Sold for 1 ref

http://www.tf2outpost.com/trade/6761380 - Sold 3 for 1 ref

http://www.tf2outpost.com/trade/6529635 - Sold for 1.11 (offer of 1 gets pushed up)

http://www.tf2outpost.com/trade/6713343 - Sold for 1 ref

http://www.tf2outpost.com/trade/6897394 - Sold for 1 ref

http://www.tf2outpost.com/trade/6721044 - Sold for 1 ref

http://www.tf2outpost.com/trade/6425557 - Sold 3 for 1 ref

Rejected offers of 0.66:

http://www.tf2outpost.com/trade/6877957 - Selling for offers, rejects 0.66 emphatically

http://www.tf2outpost.com/trade/6737264 - Sold for 1 ref (rejects offer of 0.66)

Fairly obvious that the price has consolidated to a ref. None of the sellers in OP have been looking for less than a ref for at least two weeks. This price is 2 months old and needs updating. There were more links but I chose the most relevant ones.

And for once guys, don't be mystery down voters. On almost all my suggestions there are ~5 people who down vote without posting a comment. If you have a valid reason why this shouldn't go through, tell me! Others can follow your lead - if you're right.

Let me know what you think :D