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Sale 1: Bulk.
https://backpack.tf/profiles/76561198073176682#!/compare/1556928000/1557100800
https://backpack.tf/profiles/76561198140010255#!/compare/1557014400/1557100800
Sale 2: ~20 Keys Pure.
https://backpack.tf/profiles/76561198140010255#!/compare/1557273600/1557619200
https://backpack.tf/profiles/76561198161653465#!/compare/1557532800/1557619200
https://marketplace.tf/items/603;5;u108
Sale 3: ~28 Keys.
Mar 9
$50.00 / $1.8 = 27.78 keys
https://mannco.store/item/10001 -- Thanks to doggo.
Sale 4: ~28 Keys.
May 1
$48.00 / $1.7 = 28.23 keys -- https://mannco.store/item/1
Sales: 20/28/28
Going with 20-28 keys.
Thanks to scourge for the premium!