Lemons:

90 shouldn't really be included here, they sold it for 90 and bought it back for 69, to resell at 55.

Xergoyf and I believe this should either be left outdated or 55 - 69 could work.

https://backpack.tf/item/8627324520

https://backpack.tf/profiles/76561198977776001#!/compare/1632614400/1633132800

https://backpack.tf/profiles/76561198044006735#!/compare/1632614400/1633132800

90k

https://backpack.tf/profiles/76561198044006735#!/compare/1633132800/1633219200

https://backpack.tf/profiles/76561198091442194#!/compare/1632787200/1633219200

untrace

https://backpack.tf/profiles/76561198091442194#!/compare/1634083200/1634169600

https://backpack.tf/profiles/76561198204215085#!/compare/1634083200/1634169600

bulk for frightened poltergeist fragger?

https://backpack.tf/profiles/76561198204215085#!/compare/1634688000/1634774400

https://backpack.tf/profiles/76561198310972287#!/compare/1634601600/1634774400

bulk for misty skull noble

https://backpack.tf/profiles/76561198044006735#!/compare/1635638400/1635724800

https://backpack.tf/profiles/76561198310972287#!/compare/1635552000/1635638400

Strange Ominous Stare Melted Mop (55k, https://backpack.tf/suggestion/61f500c8967a787a5040c240) + Festivized Professional Killstreak Flame Thrower (14k bo https://backpack.tf/stats/Unique/Festivized%20Professional%20Killstreak%20Flame%20Thrower/Tradable/Craftable) = 69k

https://backpack.tf/profiles/76561198044006735#!/compare/1639353600/1639526400

55k

55-69 as Lemons and Xergoyf suggested.