Sale #1

https://marketplace.tf/items/tf2/30767;5;u19

https://backpack.tf/item/11704970710

Marketplace.tf sale on 3/21/25

$24.99 / $1.92 (median value at the time) = ~13.0

Rounding to 13

Sale #2

https://marketplace.tf/items/tf2/30767;5;u19

https://backpack.tf/item/9903755723

Marketplace.tf sale on 3/31/25

$24.99 / $1.91 (median value at the time) = 13.1

Rounding to 13

Sale #3

https://marketplace.tf/items/tf2/30767;5;u19

History not found.

Marketplace.tf sale on 4/13/25

$24.99 / $1.92 (median value at the time) = ~13.0

Rounding to 13

Sale #4

https://marketplace.tf/items/tf2/30767;5;u19

https://backpack.tf/item/14040502090

Marketplace.tf sale on 4/22/25

$24.99 / $1.89 (median value at the time) = 13.2

Rounding to 13

Sale #5

https://marketplace.tf/items/tf2/30767;5;u19

History not found.

Marketplace.tf sale on 4/29/25

$24.99 / $1.94 (median value at the time) = 12.9

Rounding to 13

Sale #6

https://backpack.tf/item/14952374910

14 keys

Seller: https://backpack.tf/profiles/76561199084784906#!/compare/1743120000/1743206400 (ID: 15589368794)

Sale #7

https://backpack.tf/item/14086727522

Untraceable

https://backpack.tf/profiles/76561199028972562#!/compare/1740268800/1740355200

Sale #8

https://backpack.tf/item/14086727522

Untraceable

https://backpack.tf/profiles/76561199581722058#!/compare/1743897600/1743897600/nearest

Sale #9

https://backpack.tf/item/14086727522

Untraceable

https://backpack.tf/profiles/76561198893204680#!/compare/1744156800/1747008000

Sale #10

https://backpack.tf/item/14040502090

Untraceable

https://backpack.tf/profiles/76561198090829296#!/compare/1746144000/1746230400

Sale #11

https://backpack.tf/item/12902447689

Sold for Orbiting fire Brain Warming Wear + ~3.5 keys

https://backpack.tf/profiles/76561198329912189#!/compare/1743552000/1743638400

Orbiting fire Brain Warming Wear mini

https://marketplace.tf/items/tf2/30827;5;u33

https://backpack.tf/item/14993273743 (possibly)

Marketplace.tf sale on 5/10/25

$15.99 / $1.93 (median value at the time) = 8.3

Rounding to 8.5

Back to sale #11

8.5 + 3.5 = 12

12

Sale #12

https://backpack.tf/item/12761772829

Sold for 9 keys + ~139 ref

Buyer: https://backpack.tf/profiles/76561199235204753#!/compare/1742688000/1742774400

Rounding to 11

Sale #13

https://backpack.tf/item/12006007718

Untraceable

https://backpack.tf/profiles/76561199129957482#!/compare/1741305600/1742860800

Sale #14

https://backpack.tf/item/12006007718

11 keys

Seller: https://backpack.tf/profiles/76561199059800460#!/compare/1741564800/1741651200 (ID: 15536007510)

Sale #15

https://backpack.tf/item/7131514706

Untraceable

https://backpack.tf/profiles/76561198167514063#!/compare/1746403200/1746576000

Current sellers:

$24.99 on mp.tf

$37.06 on SCM

$21.36 on mannco.store (3x)

12.41 keys on bp.tf

13.54 keys on bp.tf

14 keys on bp.tf

Sales: 13, 13, 13, 13, 13, 14, 12, 11, 11

Using this range per instruction

Final price: 11 - 13