This needs a drop.

Classified ads at the time of posting:

http://backpack.tf/classifieds?item=Mishap+Mercenary&quality=11&tradable=1&craftable=1

1*14 refined

1*15 refined

Unsolds at 15 refined:

http://www.tf2outpost.com/trade/26164484 (~3 weeks)

http://www.tf2outpost.com/trade/26349259 (~2 days)

http://www.tf2outpost.com/trade/26364249 (~1 day, young)

http://www.tf2outpost.com/trade/26304431 (~1 week)

Unsold at 14 refined:

http://www.tf2outpost.com/trade/26322825 (Has Kills, ~6 days)

Seller at 13.66 refined:

http://www.tf2outpost.com/trade/26349496 (Has Chromatic Corruption and Voices From Below, ~2 days old)

This is all I could find on Outpost that are valid at the time of posting this suggestion.