This needs a drop.

Classified ads at time of posting:

http://backpack.tf/classifieds/?item=Knife&quality=11&tradable=1&craftable=1&australium=1

1*21 keys

4*22 keys (2 has killstreak and 1 has parts)

1*23 keys (1 has specialized killstreak and parts)

Seller at 23 keys:

http://www.tf2outpost.com/trade/25559842 (Has specialized killstreak, parts and a spell, young)

Sellers at 22 keys:

http://www.tf2outpost.com/trade/25552216 (Has killstreak and a part, young)

http://www.tf2outpost.com/trade/25543217 (Has killstreak and parts, 1 day old, young)

Sellers at 21 keys:

http://www.tf2outpost.com/trade/25533283 (2 days old)

http://www.tf2outpost.com/trade/25516521 (4 days old)

http://www.tf2outpost.com/trade/25549818 (1 day old)

Seller at 2 buds:

http://www.tf2outpost.com/trade/25359539 (2 weeks old)

This is all I could find on Outpost that are valid