resuggestion based off https://backpack.tf/suggestion/5cd85084d381721d971b9c16#comment-5d0f837c67807248cb792d91

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Sale #1 - https://marketplace.tf/items/436;5;u31 / https://backpack.tf/item/3448387282

15.99 / 1.78 = 8.98 keys

Sale #2 - https://marketplace.tf/items/436;5;u31

17.99 / 1.8 = 9.99 keys

Sale #3 - 7 keys?

https://backpack.tf/profiles/76561198799198867#!/compare/1551052800/1554249600

https://backpack.tf/profiles/76561198363395191#!/compare/1551052800/1551139200

Sale #4 - Untrace

https://backpack.tf/profiles/76561198215813163#!/compare/1554422400/1554508800

https://backpack.tf/profiles/76561198132166425#!/compare/1554422400/1554508800

Sale #5 - Untrace

https://backpack.tf/profiles/76561198363395191#!/compare/1554508800/1554595200

https://backpack.tf/profiles/76561198132166425#!/compare/1554508800/1554595200

Sale #6 - less then 2 keys in items

https://backpack.tf/profiles/76561198215993605#!/compare/1554940800/1555027200

https://backpack.tf/profiles/76561198306933797#!/compare/1554940800/1555027200

Sale #7 - Untrace

https://backpack.tf/profiles/76561198306933797#!/compare/1555027200/1555113600

https://backpack.tf/profiles/76561198158795399#!/compare/1555027200/1555113600

Sale #8 - 7 keys + 10 ref skin

https://backpack.tf/profiles/76561198158795399#!/compare/1555027200/1555113600

https://backpack.tf/profiles/76561198302399911#!/compare/1555027200/1555113600

Sale #9 - Untrace

https://backpack.tf/profiles/76561198302399911#!/compare/1555200000/1555372800

https://backpack.tf/profiles/76561198210697177#!/compare/1555286400/1555372800

Sale #10 - Untrace

https://backpack.tf/profiles/76561198066693205#!/compare/1555718400/1555804800

https://backpack.tf/profiles/76561198382290208#!/compare/1555718400/1555804800

Sale #11 - Bulk

https://backpack.tf/profiles/76561198210225228#!/compare/1555718400/1555804800

https://backpack.tf/profiles/76561198373303727#!/compare/1555286400/1555977600

Sale #12 - scm?

https://backpack.tf/profiles/76561198373303727#!/compare/1555977600/1556064000

https://backpack.tf/profiles/76561198163665060#!/compare/1557100800/1557619200

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Because of multiple sellers at 8, we are going 8 - 9 here

Credits to Vince!

That's it and that's all.