updata include marketplace sellers

https://marketplace.tf/items/tf2/31080;5;u123 3 marketplace sales in the past 3 months

https://marketplace.tf/items/tf2/5021;6

$24.99 on Sep 20, Nov 16, Dec 4

Sep 20 24.99/1.84 = 13.6

Nov 16 24.99/1.95 = 12.8

Dec 4 24.99/1.85 = 13.5

Old sellers at $21.99, including at 12 keys

https://backpack.tf/profiles/76561198081545518#!/compare/1639440000/1639526400

https://backpack.tf/profiles/76561198118922746#!/compare/1639353600/1639440000

added 26 keys for stormy storm hard counter, using there

https://backpack.tf/profiles/76561198081545518#!/compare/1637539200/1637625600

https://backpack.tf/profiles/76561198074924284#!/compare/1637020800/1637366400

looks like 14 keys from manncostore, likely sale

current seller at 14

sellers 12, around 13, 14, 14