only realised after making this that previous sugg is in-date, but all sales used in that sugg are now out of date

Sale 1:

https://marketplace.tf/items/tf2/633;5;u18

$19.99 / $1.67 = 11.97 keys

Sale 2:

untrace

https://backpack.tf/profiles/76561198108448982#!/compare/1575590400/1575676800

https://backpack.tf/profiles/76561198002757046#!/compare/1575504000/1575590400

Sale 3:

untrace

https://backpack.tf/profiles/76561198002757046#!/compare/1575849600/1575936000

https://backpack.tf/profiles/76561198076395081#!/compare/1575849600/1576281600

Sale 4:

untrace

https://backpack.tf/profiles/76561198076395081#!/compare/1576281600/1576454400

https://backpack.tf/profiles/76561198337734785#!/compare/1576368000/1576454400

Sale 5:

untrace

https://backpack.tf/profiles/76561198337734785#!/compare/1577059200/1577145600

https://backpack.tf/profiles/76561198094702545#!/compare/1577145600/1578787200

Sale 6:

untrace

https://backpack.tf/profiles/76561198283662274#!/compare/1571961600/1574812800

https://backpack.tf/profiles/76561198337734785#!/compare/1574726400/1574812800

Sale 7:

untrace

https://backpack.tf/profiles/76561198337734785#!/compare/1575244800/1575331200

https://backpack.tf/profiles/76561198796395930#!/compare/1575244800/1575331200

Sale 8:

b/o 12 keys: https://imgur.com/a/riQ2F90

Aces High Bolted Bicorne(8) + 4 keys

https://backpack.tf/profiles/76561198796395930#!/compare/1575590400/1575676800

https://backpack.tf/profiles/76561198094041769#!/compare/1575590400/1575676800

Bicorne: https://backpack.tf/suggestion/5e20d47ebc00ae2e035de2b5

Sale 9:

Aces High Coldsnap Cap(15.5)

https://backpack.tf/profiles/76561198094041769#!/compare/1575676800/1576195200

https://backpack.tf/profiles/76561198971152948#!/compare/1576108800/1576195200

Sale 10:

9 keys

https://backpack.tf/profiles/76561198416405381#!/compare/1576108800/1576195200

https://backpack.tf/profiles/76561198258055271#!/compare/1576108800/1576195200

Sale 11:

bulk

https://backpack.tf/profiles/76561198258055271#!/compare/1576195200/1576281600

https://backpack.tf/profiles/76561198106645651#!/compare/1575936000/1576281600

==============================================================================

Sales:

9, 12, 12, 15.5

coldsnap dumped to scrap after sale so excluding

buyers at 9 keys: https://imgur.com/a/xz50H6d

unsold for 1 month at 10.4 keys: https://imgur.com/a/6XfLzyR