first suggestion, going for the low hanging fruit

1 of 1 hat

Item 1 : https://backpack.tf/item/17524880370

Sale 1 : sold for 100 keys

https://backpack.tf/profiles/76561198143710298#!/compare/1789084800/1789171200

https://backpack.tf/profiles/76561198094394179#!/compare/1789084800/1789171200

https://imgur.com/a/47BNAEC

Sellers : none 1 of 1

bptf -none

mptf - https://marketplace.tf/browse/tf2?seffect%5B%5D=67&sterm=runner+warm+up - none

stn - not listed

scm - https://steamcommunity.com/market/listings/440/Unusual%20Runner's%20Warm-Up?appid=440&q=electrostatic&sort=0&dir=0 - none

Sales: 100 keys

slam dunk @100 keys