Sale 1:

Sold for $35 on Marketplace.tf

https://marketplace.tf/items/30008;5;u59

https://backpack.tf/item/5395408125

35/1.9 = ~18.4

X = 18

Sale 2:

Sold for Blizzardy Storm Cowl (17) + ~1 key in items

No outpost

Seller: https://backpack.tf/profiles/76561198159149142#!/compare/1506902400/1506988800

Buyer: https://backpack.tf/profiles/76561198203170950#!/compare/1506816000/1506988800

Was used on the Cowl, however, the items added with the cowl were not taken into account, and there’s already a pure sale at the same price as this sale, so should be fine to use here.

X = 18

Sale 3:

Sold for Potassium Bonnet (12)

Seller: https://backpack.tf/profiles/76561198110463574#!/compare/1509235200/1509321600

Buyer: https://backpack.tf/profiles/76561198195010677#!/compare/1509148800/1509235200

Sale 4:

Sold for Phosphorus Dead Cone

http://www.tf2outpost.com/trade/29385096 - B/O of 18

Seller: https://backpack.tf/profiles/76561198106495563#!/compare/1506902400/1506988800

Buyer: https://backpack.tf/profiles/76561198159149142#!/compare/1506902400/1506988800

Can be used on the cone.

Sellers:

19 keys:

https://i.imgur.com/PhQvhJ1.png - 1 month

Sales at:

12

18 (2x)

Buyer at 13, excluding 12.

Going with 18 flat.