This needs a drop.

Classified ads at the time of posting:

http://m.imgur.com/tPH8qVc

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

3*1.37 keys

4*1.5 keys

1*1.56 keys

1*1.6 keys

1*1.62 keys (Has specialized killstreak)

Unsold at 1 key and 9.66 refined (~1.6 keys):

http://www.tf2outpost.com/trade/27372506 (~2 days)

http://www.tf2outpost.com/trade/27332996 (~1 week)

Unsold at 1.6 keys:

http://www.tf2outpost.com/trade/27304302 (~2 weeks)

Unsold at 1 key and 8 refined (~1.5 keys):

http://www.tf2outpost.com/trade/27358751(~4 days)

Seller at 1 key and 6 refined (~1.4 keys):

http://www.tf2outpost.com/trade/27316142 (Has killstreak, ~1 week)

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