https://marketplace.tf/items/tf2/30708;5;u102

$69.99 / $1.89 = 37.03 keys

$69.99 / $1.81 = 38.67 keys

https://backpack.tf/item/8868079588

https://mannco.store/item/440-its-a-puzzle-to-me-unusual-hellmet

$60 / $1.66 = 36.14 keys

$47.95 / $1.68 = 28.54 keys

https://backpack.tf/item/10319868135

https://backpack.tf/item/8868079588

https://gladiator.tf/sales?item=It%27s%20a%20puzzle%20to%20me%20Hellmet&at=2021-09-23T02:01:13.753Z

Sales at 33 and 36 keys

Buy at ~28 keys

https://backpack.tf/profiles/76561198261483133#!/compare/1630800000/1630886400

https://backpack.tf/profiles/76561198103480585#!/compare/1630800000/1630886400

Starstorm Insomnia Powdered Practitioner + 1 key

https://backpack.tf/profiles/76561198138342004#!/compare/1625529600/1625875200

https://backpack.tf/profiles/76561198163549413#!/compare/1625788800/1625875200

Bulk for Special Snowfall Professional's Pom Pom

https://backpack.tf/profiles/76561198163549413#!/compare/1625875200/1625961600

https://backpack.tf/profiles/76561198017901187#!/compare/1625875200/1626048000

42 keys 1 refined

https://backpack.tf/profiles/76561199110809353#!/compare/1625702400/1625788800

https://backpack.tf/profiles/76561198091502579#!/compare/1625702400/1625788800

Untraceable

https://backpack.tf/profiles/76561198049149130#!/compare/1625961600/1628640000

https://backpack.tf/profiles/76561199111664710#!/compare/1628640000/1628726400

28 keys 6 refined

https://backpack.tf/profiles/76561199111664710#!/compare/1628899200/1628985600

https://backpack.tf/profiles/76561198336605191#!/compare/1628899200/1628985600

Untraceable

https://backpack.tf/profiles/76561198336605191#!/compare/1628985600/1629072000

https://backpack.tf/profiles/76561197986849900#!/compare/1628985600/1629158400

Untraceable

https://backpack.tf/profiles/76561198055622215#!/compare/1628294400/1628380800

https://backpack.tf/profiles/76561198198440035#!/compare/1628294400/1628380800

29 keys

https://backpack.tf/profiles/76561198198440035#!/compare/1628294400/1628380800

https://backpack.tf/profiles/76561197968575242#!/compare/1628294400/1628380800

17 keys matches, untraceable

https://backpack.tf/profiles/76561197968575242#!/compare/1628899200/1628985600

https://backpack.tf/profiles/76561198065436693#!/compare/1628812800/1628985600

Bulk for Sunbeams Eyewear

https://backpack.tf/profiles/76561198065436693#!/compare/1630281600/1630627200

https://backpack.tf/profiles/76561199006679800#!/compare/1630195200/1630281600

Untraceable

https://backpack.tf/profiles/76561199006679800#!/compare/1631059200/1631145600

https://backpack.tf/profiles/76561198053277193#!/compare/1631059200/1631145600

Untraceable

https://backpack.tf/profiles/76561198053277193#!/compare/1631145600/1631232000

https://backpack.tf/profiles/76561198260247509#!/compare/1631059200/1631232000

Untraceable

https://backpack.tf/profiles/76561198993873071#!/compare/1625443200/1625529600

https://backpack.tf/profiles/76561199125443371#!/compare/1625443200/1625529600

Untraceable

https://backpack.tf/profiles/76561199125443371#!/compare/1630022400/1630108800

https://backpack.tf/profiles/76561198420668120#!/compare/1630022400/1630108800

Untraceable

https://backpack.tf/profiles/76561198420668120#!/compare/1630108800/1630195200

https://backpack.tf/profiles/76561198179707937#!/compare/1629936000/1630108800

Omniscient Orb A Head Full of Hot Air, better used there

https://backpack.tf/profiles/76561198032347681#!/compare/1628726400/1629936000

https://backpack.tf/profiles/76561198280524116#!/compare/1628640000/1628726400

Untraceable

https://backpack.tf/profiles/76561198256844594#!/compare/1625529600/1626220800

https://backpack.tf/profiles/76561199010409947#!/compare/1626134400/1626220800

27 keys

https://backpack.tf/profiles/76561199010409947#!/compare/1626134400/1626220800

https://backpack.tf/profiles/76561198069265590#!/compare/1626134400/1626220800

28 keys

Sales:

27

28

28

28

29

29

33

36

36

37

39

42

https://gyazo.com/1c86cb0aba5cfdebb546b38b53b93fd6

Buyers 30-31

Lot of sales at 28-29 but they are mostly on the older side

Going with 33-42