Non KS:

https://marketplace.tf/items/tf2/224;14

27.6k

https://backpack.tf/item/2547379461

https://backpack.tf/profiles/76561198286462528#!/compare/1630281600/1630540800

bulk

https://backpack.tf/profiles/76561198286462528#!/compare/1630972800/1631059200

https://backpack.tf/profiles/76561198069674214#!/compare/1630800000/1631404800

movement or smth idk

Pro KS:

https://gladiator.tf/sales?item=Collector%27s%20Professional%20Killstreak%20L%27Etranger&at=2021-09-17T05:33:09.081Z

https://backpack.tf/item/4026380517

https://backpack.tf/item/3279031736

40k not countered

https://steamcommunity.com/market/pricehistory/?country=US&currency=1&appid=440&market_hash_name=Collector%27s%20Professional%20Killstreak%20L%27Etranger

41.1k

https://backpack.tf/item/3848993710

https://backpack.tf/profiles/76561198422094914#!/compare/1626739200/1626825600

bulk

https://backpack.tf/item/3279031736

https://backpack.tf/profiles/76561198235774954#!/compare/1627862400/1629763200

untrace

https://backpack.tf/item/3241357686

https://backpack.tf/profiles/76561198113308817#!/compare/1630800000/1631145600

?

https://backpack.tf/item/3133480251

https://backpack.tf/profiles/76561198158568880#!/compare/1623974400/1624060800

unsure

https://backpack.tf/profiles/76561198139832291#!/compare/1626220800/1629849600

?

https://backpack.tf/item/2361092581

https://backpack.tf/profiles/76561198045215418#!/compare/1624838400/1625616000

buy orders prob.

https://backpack.tf/profiles/76561199059160806#!/compare/1630108800/1630195200

36k on bot's end, snapshot suggests 40k: https://gladiator.tf/listings/612a80db86bce79e7030708a, perhaps negotiation involved

Just from the few sales available here, pro ks seems to sell significantly higher than the its non ks counterpart, which higher pro ks buyers at ~26 compared to ~19 for non ks also support - going to exclude pro ks sales here.

Taking 27.6 flat.