Sale #1:

https://marketplace.tf/items/318;5;u32/Orbiting%20Planets%20Prancer's%20Pride

https://i.imgur.com/Th61gvb.png

$17.99 x .9 = $16.19

$16.19 / $1.77 = ~9.1 keys

9 keys

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Sale #2:

https://marketplace.tf/items/318;5;u32/Orbiting%20Planets%20Prancer's%20Pride

https://i.imgur.com/MIRdFEG.png

$19.68 x .9 = $17.71

$17.71 / $1.81 = ~9.8 keys

10 keys

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Sale #3:

https://backpack.tf/profiles/76561198347495247#!/compare/1548547200/1548806400

Sold with ~3 keys for a Smoking Airdog (10 keys)

10 x .9 = 9

9 - 3 = 6

~6 keys

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Minis:

Smoking Airdog:

https://marketplace.tf/items/30767;5;u35

https://i.imgur.com/tajD88w.png

$19.50 x .9 = $17.55

$17.55 / $1.75 = ~10 keys

10 keys

Can't find any other good sales that aren't quicksales, any additional proof would be appreciated.