Full Disclaimer: I have recently bought one.

Last time I will suggest. Resuggested to set a flat price

-Keys were 1.83 at the time of my purchase (6/26/19)

190/1.83 = 103.8 rounded up is 104

https://marketplace.tf/items/tf2/5021;6

- Marketplace page has 2 sales, the sale for $190 being mine, and the one for $130 being from September 2018.

https://marketplace.tf/items/tf2/30993;5;u17

-Screenshots of user Doe's purchase for 109 keys pure (currently on marketplace for $280)

https://imgur.com/a/DXMsRVf

-History for Doe's Punk

https://backpack.tf/item/6980465702

-Screenshots of my recent purchase for $190 on marketplace

https://imgur.com/a/6ayzpNt

-Current Sales

*There is one on the Steam Community Market going for $248.11

https://steamcommunity.com/market/listings/440/Unusual%20Punk%27s%20Pomp

*The current one on market place for $280 (link above)

*There is one on Mannco.store, however I'm not sure how reliable that website is

https://mannco.store/item/5285

*There is one on Bazaar.tf with no B/O and no visible offers.

https://bazaar.tf/trade/1626676

Resuggested again for 104 flat