Only recent sale:

Sold for a Duped Misty Skull Charmer's Chapeau

(136*0.9) = 122.4 rounding to 120 keys

No outpost trade

Seller Before: http://backpack.tf/profiles/76561198066701092?time=1429686000

Seller After: http://backpack.tf/profiles/76561198066701092?time=1429945200

Notes:

Mini for the Duped Misty Skull Charmer's Chapeau: ~136

1 for 1 with a Duped Frostbite Pyromancer's Mask

(218*0.9) = 196.2 capping at 136

Seller Before: http://backpack.tf/profiles/76561198013095772?time=1427958000

Seller After: http://backpack.tf/profiles/76561198013095772?time=1428130800

http://www.tf2outpost.com/trade/25810187

Seller at 136, because 218 is the lowest duped sale recently, but someone is selling a clean one for 136

http://www.tf2outpost.com/trade/25810187

Mini mini for the Duped Frostbite Pyromancer's Mask ~218

Sold for a Green Energy Exquisite Rack, 3 buds and 25 keys (buds were 12 keys)

(174*0.9) + 25 + (12*3) = 217.6 rounding to 218 keys

http://www.tf2outpost.com/trade/24971901

Seller Before: http://backpack.tf/profiles/76561198066429990?time=1425628800

Seller After: http://backpack.tf/profiles/76561198066429990?time=1425715200

Conclusion:

Only one recent sale at 120, taking the final price at 120 keys.