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Marketplace.tf: https://marketplace.tf/items/tf2/31041;5;u58
Sale 1:
May 24 - $40 / $1.88 = 21.28 keys, No B/O
= 21 Keys.
Sale 2:
Jul 6 - $36.99 / $1.99 = 18.59 keys, https://backpack.tf/item/8274618488 (?) - No B/O
= 19 Keys.
Sale 3:
Jul 18 - $36.99 / $2.00 = 18.50 keys, No B/O
= 19 Keys.
Sale 4:
Jul 23 - $36.99 / $1.92 = 19.27 keys, No B/O
= 19 Keys.
Sales: 19, 19, 19, 21
Going with 19-21 keys.