Becoming quite hard to sell these at 10 keys, classifieds has lots unsold for that price and one selling for 9.5. Definitely possible to pick one up for 9.5 keys.

10 keys

http://www.tf2outpost.com/trade/8200140 - Unsold for 10 keys

http://www.tf2outpost.com/trade/8261314 - Unsold for 10 keys

http://www.tf2outpost.com/trade/8166595 - Unsold for 10 keys

http://www.tf2outpost.com/trade/8251332 - Unsold for 10 keys

http://www.tf2outpost.com/trade/8264191 - Unsold for 10 keys

http://www.tf2outpost.com/trade/8154636 - Unsold for 10 keys

http://www.tf2outpost.com/trade/7924953 - Unsold for 10 keys

http://www.tf2outpost.com/trade/8186357 - Sold for 10 keys

http://www.tf2outpost.com/trade/8227707 - Sold for 10 keys

9.5 keys

http://www.tf2outpost.com/trade/8284261 - Selling for 9.5 keys

http://www.tf2outpost.com/trade/8185350 - Selling for 9.5 keys

http://www.tf2outpost.com/trade/8301715 - Selling for SF Sandvich (9.5 keys)

http://www.tf2outpost.com/trade/8138401 - Sold for 9.5 keys

Hard to get more proof with the Outpost update, but I'd imagine that, considering there are ones unsold at this price, there were quite a few more. Range needed, in my opinion.