Ursack prices have taken wild swings in the past as material costs made sudden changes. IIRC, they’ve had to switch materials for the Major several times due to price or availability problems.
Also, there is this:
We are pleased to report that MMI Textiles, Inc./Bear Saga, LLC have purchased Ursack effective November 27, 2018.
https://www.ursack.com/ursack-has-new-owners/
Probably a coincidence.
And this: the mmitextiles.com web site seems to be badly broken.
Probably another coincidence.
You do believe in coincidences, don’t you?
— Rex
PS – Ursack Minor bags still available at old prices from other vendors. Google DuckDuckGo is your friend.