There are more sales:

https://backpack.tf/item/10191422243

https://backpack.tf/item/9931540678

https://backpack.tf/item/9876718314

https://backpack.tf/item/9816415935

https://backpack.tf/item/9746595745

https://backpack.tf/item/9480635825

https://backpack.tf/item/9411835437

https://backpack.tf/item/9407999042

https://backpack.tf/item/9380997387

https://backpack.tf/item/9379497230

https://backpack.tf/item/9374908633

https://backpack.tf/item/9369835667

https://backpack.tf/item/9363281248

https://backpack.tf/item/9339248953

https://backpack.tf/item/9320885945

https://backpack.tf/item/9319302356

https://backpack.tf/item/9318537132

https://backpack.tf/item/9313495411

https://backpack.tf/item/9312100181

https://backpack.tf/item/9308819269

https://backpack.tf/item/9302982522

https://backpack.tf/item/9302155898

https://backpack.tf/item/9293393433

https://backpack.tf/item/9290976478

https://backpack.tf/item/9290936249

https://backpack.tf/item/9287962557

https://marketplace.tf/items/tf2/31146;5;u162

$16.99 / $2.19 = 7.76 keys

$16.99 / $2.19 = 7.76 keys

$16.99 / $2.19 = 7.76 keys

$16.99 / $2.19 = 7.76 keys

$17.99 / $2.14 = 8.41 keys

$17.99 / $2.02 = 8.91 keys

$19.99 / $2.00 = 9.99 keys

https://mannco.store/item/24762

$13.95 / $1.91 = 7.30 keys

$13.95 / $1.92 = 7.27 keys

$13.95 / $1.93 = 7.23 keys

$13.95 / $1.96 = 7.12 keys

$13.94 / $1.96 = 7.11 keys

$13.94 / $1.96 = 7.11 keys

$13.95 / $1.97 = 7.08 keys

$16.2 / $1.96 = 8.27 keys

$17.5 / $1.93 = 9.07 keys

$17.5 / $1.89 = 9.26 keys

$17.5 / $1.82 = 9.62 keys

$13.95 / $1.82 = 7.66 keys