Re-suggesting, thanks to blaze.

Sale 1: Untrace.

https://backpack.tf/profiles/76561198230732648#!/compare/1550966400/1551052800

https://backpack.tf/profiles/76561198053717045#!/compare/1550966400/1551052800

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Sale 2: ~22 Keys.

Sold For Mega Strike Taunt: Kazotsky Kick (14) + Holy Grail Taunt: Most Wanted (4) + Strange Sapper (2) + Strange Iron Bomber (1) + 2 Keys = 23

(B/O Cap 22, https://bot.tf/stats/listings/ML8NZQO4)

https://backpack.tf/profiles/76561198053717045#!/compare/1551398400/1551484800

https://backpack.tf/profiles/76561198318252351#!/compare/1551398400/1551484800

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Sale 3: Use There.

Sold For Cloud 9 Wet Works.

https://backpack.tf/profiles/76561198086333705#!/compare/1555113600/1555200000

https://backpack.tf/profiles/76561198882972479#!/compare/1555113600/1555200000

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Sale 4: ~19 Keys

Sold For Miami Nights Hottie's Hoodie (19)

https://backpack.tf/profiles/76561198882972479#!/compare/1555286400/1555372800

https://backpack.tf/profiles/76561198202572818#!/compare/1555027200/1555372800

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Sale 5: Use There.

Sold For Orbiting Planets Cold Killer.

https://backpack.tf/profiles/76561198202572818#!/compare/1555027200/1557100800

https://backpack.tf/profiles/76561198046921199#!/compare/1555286400/1555372800

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Sale 6: ~15 Keys Pure. (Calling Low)

https://backpack.tf/profiles/76561198046921199#!/compare/1555891200/1555977600

https://backpack.tf/profiles/76561198067699902#!/compare/1555891200/1555977600

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Sale 7: ~19 Keys.

Sold With 2 Keys For Stormy Storm Flamboyant Flamenco (21).

21-2=19

https://backpack.tf/profiles/76561198067699902#!/compare/1556323200/1556409600

https://backpack.tf/profiles/76561198320638936#!/compare/1556323200/1556409600

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Sale 8: ~20 Keys.

Sold For Morning Glory Pyro's Boron Beanie. (22)

(B/O Cap 20, https://bot.tf/stats/listings/4REDW85M)

https://backpack.tf/profiles/76561198320638936#!/compare/1556323200/1556409600

https://backpack.tf/profiles/76561198093151023#!/compare/1556323200/1556409600

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Sale 9: Bulk.

https://backpack.tf/profiles/76561198093151023#!/compare/1556582400/1556668800

https://backpack.tf/profiles/76561198847680167#!/compare/1556582400/1556668800

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Sale 10: Untrace/High.

https://backpack.tf/profiles/76561198847680167#!/compare/1557360000/1557446400

https://backpack.tf/profiles/76561198837921736#!/compare/1556409600/1557705600

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Marketplace.tf Sales:

https://marketplace.tf/items/151;5;u56

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Sale 11: ~20 Keys.

Mar 27, 19

$35.99 / $1.78 = 20.22 keys

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Usable Sales: 19/19/20/20/22

Going With 19-22 Keys.

Thanks to scourge for giving me premium to make price suggestions :3

I missed again, ffs

Sale 8:

Sold With 3 Keys For Morning Glory Pyro's Boron Beanie (22)

(22-3=19)

Fits in the range.