This thing spins.

Classified ads at the time of posting:

http://m.imgur.com/OqKCtNL

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

2*7 keys

1*7.22 keys (Has Killstreak and parts)

1*7.27 keys (Has a part)

1*7.38 keys (Has Exorcism and Killstreak)

3*7.49 keys (1 has Killstreak and 1 has a part)

Unsolds at 7 keys and 9 refined (~7.5 keys):

http://www.tf2outpost.com/trade/28126790 (Has Killstreak, ~1 week)

http://www.tf2outpost.com/trade/28127179 (Has Heavies Killed, ~1 week"

Unsold at 7 keys and 7 refined (~7.4 keys):

http://www.tf2outpost.com/trade/28129655 (Has Killstreak and Exorcism, ~1 week)

Unsold at 7 keys and 5 refined (~7.3 keys):

http://www.tf2outpost.com/trade/28088187 (Has Demoman Killed, ~3 weeks, poorly bumped)

Seller at 7 keys:

http://www.tf2outpost.com/trade/28121082 (~1 week old)

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