Circling Heart Powdered Practitioner

Sale 1: 36 keys pure (took 4 days)

https://backpack.tf/profiles/76561198292156436#!/compare/1525478400/1525564800

Sale 2: 42 keys pure (took 1 day)

https://backpack.tf/profiles/76561198056086416#!/compare/1525046400/1525132800

Sale 3: 57 USD on mp.tf --> 1 key = 1.96 USD --> 29 keys

https://marketplace.tf/items/30069;5;u19

https://backpack.tf/item/6479372401

Sale 4: 89.99 USD on mptf --> 1 key = 1.98 USD --> 45 keys

https://marketplace.tf/items/30069;5;u19

https://backpack.tf/item/5034722970

Sale 5: 57.07 USD on mp.tf --> 1 key = 1.96 USD --> 29 keys

https://marketplace.tf/items/30069;5;u19

Sale 6: Sold for TW Patriot Peak

https://backpack.tf/profiles/76561198105071091#!/compare/1526169600/1526342400

Using there

Sales at 29, 29, 36, 42, 45.

Seller at 100 USD - unsold for months

https://backpack.tf/item/6479372401

Seller at 52 keys unsold for 1+ month; buyer at 27 https://i.imgur.com/hDz1REy.png

Suggesting 36 to 45. 29 seems low.