Sale #1:

https://backpack.tf/profiles/76561198055622215#!/compare/1547942400/1548028800

Sold with a for an Open Mind Vampire Vanquisher (18 keys)

18 keys

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Sale #2:

https://marketplace.tf/items/96;5;u60

Sold on December 26, 2018 for $28.

$28 / $1.79 = ~15.6

16 keys

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Minis:

Open Mind Vampire Vanquisher:

https://backpack.tf/profiles/76561198243238038#!/compare/1545609600/1545696000

Sold with a Voltaic Hat Protector Universal Translator (15 keys) for a Sunbeams Puffy Polar Cap (33 keys).

18 keys