Thanks to Machelix for updating the Searing Plasma one so I can finally price this!

Sale 1 (around November 24th):

1:1 with SP Brim (2.15 buds), unsure which was offered

2.15*.9=1.9

http://www.tf2outpost.com/trade/24339718

http://www.tf2outpost.com/trade/24494678

http://backpack.tf/profiles/76561198078478173?time=1416729600

http://backpack.tf/profiles/76561198078478173?time=1416816000

Total:1.9 buds

Sale 2 (around November 23rd):

1:1 with a Terror-Watt Human Cannonball (almost outdated at 2.7 but not), unsure which was offered

2.7*.9=2.43, rounding to 2.4

http://backpack.tf/profiles/76561198078478173?time=1416643200

http://backpack.tf/profiles/76561198078478173?time=1416729600

Total:2.4 buds

In conclusion, rare hat as there's 2 in existence, 1 on market, and 2 sales. 1.9-2.4 should do.

Constructive criticism welcome!