-Bulk for a Smissmas Caribou: https://backpack.tf/profiles/76561198099260958#!/compare/1584403200/1584489600 https://backpack.tf/profiles/76561198006981147#!/compare/1583452800/1584403200

-44.44 USD on marketplace, or roughly 26 keys. Fine excluding since it was listed for under a day before it sold (thanks Gibson for reporting this one to me): https://marketplace.tf/items/tf2/325;6;strange;kt-3https://backpack.tf/item/5185143857

- 37.72 USD on the SCM; ~15 keys according to Feb key prices: https://backpack.tf/profiles/76561198042340876#!/compare/1580342400/1580688000 https://backpack.tf/profiles/76561198118959715#!/compare/1580601600/1580688000 https://steamcommunity.com/market/listings/440/Strange%20Professional%20Killstreak%20Boston%20Basher

With 26 having sold really fast and SCM sales for strange unique not being the most consistent (some such as the one above don't even have their own SCM pages), I'm just going to accept this as is.