Link 1 has an offer of 17 pure, and another of 18 (available through the Cloudy Moon CM). Also an offer for the Stash+7 for a Burning Kabuto.

Link 2 also has an offer for the Stash+7 for a Burning Kabuto.

Link 3 has an offer at $525, and sold for 17 pure.

In summary, plenty of offers at the 17 mark; current owners won't take less than that. Some exceed 17 buds, including offers of 18 pure, and even the occasional 19 (http://www.tf2outpost.com/trade/7780903). Many unusual offers 20+.