This needs a drop.

Classified ads at time of posting:

http://m.imgur.com/Zqy9THe

http://backpack.tf/classifieds/?item=Festive%20Minigun&quality=11&tradable=1&craftable=1

1*9 keys

2*9.42 keys (1 has specialized killstreak and Exorcism)

1*9.47 keys

2*9.52 keys (1 has killstreak and damage dealt part)

Unsold at 9 keys and 10 refined (~9.5 keys):

http://www.tf2outpost.com/trade/26178469 (Has killstreak and damage dealt part, 1 day, young)

Unsold at 9 keys and 8 refined (~9.5 keys):

http://www.tf2outpost.com/trade/26173471 (Has specialized killstreak and Exorcism, ~2 days)

Seller at 9 keys:

http://www.tf2outpost.com/trade/26173471 (~2 days old)

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