choo choo!

https://marketplace.tf/items/tf2/30105;5;u33

Sale 1: Sold for $36

Key Price: $1.83

36 / 1.83 = 19.67. Rounded to 20.

https://backpack.tf/item/3941696066

Sale 2: Sold for Kill-A-Watt Elf Esteem (7-9 keys : Middle is 8) + Taunt: Scotsmann's Stagger (42.88-43 ref : Middle is 42.94) + Taunt: Square Dance (26.44-26.55 ref : Middle is 26.5) = 9.58. Rounded to 10 keys.

https://backpack.tf/profiles/76561198854662187#!/compare/1563494400/1563580800

https://backpack.tf/profiles/76561197996095002#!/compare/1563494400/1563580800

https://backpack.tf/item/3941696066

Sale 3: Sold for a Strange Australium Scattergun (26-27.9 keys : Middle is 26.95. Rounded to 27 keys.)

https://backpack.tf/profiles/76561197996095002#!/compare/1563753600/1563840000

https://backpack.tf/profiles/76561198392707053#!/compare/1548806400/1563840000

10 keys is very close to buyers and is considered an outlier due to two sales in the 20's.

FINAL PRICE RANGE: 20-27 KEYS