None in classifieds. I own one, but don't intend to sell - Throw that out the window. Took me well over a week to buy one at 0.66 - and I'm a Blue Donator on Outpost.

http://www.tf2outpost.com/trade/9110425 - 1 ref offer on Diamondback

http://www.tf2outpost.com/trade/8701566 - 0.77 on Diamondback (2 weeks old)

http://www.tf2outpost.com/trade/4871281 - In comments, the owner wants 1.66, but the fact remains there are many offers of 0.66-0.88.

http://www.tf2outpost.com/trade/8737323 - 1 ref on diamondback. Was added in the same week as it was posted for this price. Does not have it in his backpack. Assumed to be sold at this price.

http://www.tf2outpost.com/trade/9134083 - a seller for 2 rec. Wish I'd seen this before I bought mine.

http://bazaar.tf/trade/109062 - MisterFister 5 days ago offered 1 refined on his Diamondback

People ARE prepared to pay more than 0.66 for these. People are also prepared to sell at 0.66 for these. This does need a minor bump.