For the small number of people out there that need cartridge filters for their SoClean CPAP cleaner, this is an excellent deal. Per what I've been able to find, merchandise from the SoClean storefront is directly sold from manufacturer (I personally want to buy these from an unknown source given what they are for).
Base price is now 15.00 (dropped from 17.87). These usually are 30 so this is now 50% off.
Normal price - 30$ w/ free prime shipping
Sale price -
15.00 w/ free prime shipping
subscribe and save 5% off price -
subscribe and save 15% off price -
Per CCC this is lowest price since roughly July 2016 by ~10 dollars.
I assume these things don't go bad so I stocked up for my older family members. I've ordered these before last year and none of my family members had problems with them.