It takes me 30 minutes to find a single sale for Cancer tier hats. That's how cancer they are.

Sale 1 OUTLIER

http://www.tf2outpost.com/trade/24483273 Sold for OF Cyborg Stuntman

B/O for Stuntman was 11 keys

B/O for HWAH was 15 keys

X = 10*0.9

X = 9

Stuntman http://backpack.tf/item/2681675604

HWAH http://backpack.tf/item/1096614435

Mini for Stuntman

[No OP Trade] Sold for 11 keys in Parted Garbage

X = 11*0.9

X = 10

Stuntman http://backpack.tf/item/2681675604

Parted Garbage http://backpack.tf/profiles/76561198106474244?time=1420272000#page3

Sale 2

http://www.tf2outpost.com/trade/23761831 Sold for Bubbling Softcap + a Spec KS S. Launcher

B/O for HWAH was 13 keys

B/O for Softcap was 14 keys

X = 14*0.9 + amount that would exceed the B/O

X = 13

Softcap http://backpack.tf/item/3002510592

HWAH http://backpack.tf/item/1880421230

Softcap was in-date at the time

Sale 3

http://www.tf2outpost.com/trade/23967990 Sold for Smoking Nanobalaclava (Nano was brokered)

Nano had no trade, presuming offered

X = 14*0.9

X = 13

Nano http://backpack.tf/item/2829193053

HWAH http://backpack.tf/item/2501886960