Using sales only after November 1, 2018

Marketplace https://marketplace.tf/items/17232;11;w1;pk232/Strange%20Alien%20Tech%20War%20Paint%20(Factory%20New)

$27.00 / 1.77 - 15.25 keys

$31.00 / 1.72 - 18 keys

$31.00 / 1.72 - 18 keys

https://steamcommunity.com/market/listings/440/Strange%20Alien%20Tech%20War%20Paint%20%28Factory%20New%29

I don't know how to get a usable key price for SCM but if I sell a key for the going price now, I receive $1.89 https://i.imgur.com/Eb0mUkR.png

So that's what I'm going by in accordance with the dates for the sales

$37.50 / 2.09 - 17.95 keys

$37.81 / 1.99 - 19

$26.67 / 1.99 - 13.4

$27.18 / 1.95 - 13.95

$33.52 / 1.97 - 17

$33.76 / 1.90 - 17.8

https://backpack.tf/stats/Strange/Alien%20Tech%20%7C%20War%20Paint%20(Factory%20New)/Tradable/Craftable

One seller is selling 5 of them on marketplace.tf for approximately 19.5 keys

Quickbuyers for 11.3 and 12.8

The three sales for 13, 13, and 15 are relatively older sales in November, and this item sees more action in between 17-19. There's quickbuyers for 12, so I would say 13-15 is an outlier.