I found one source of clinoptilolite for $ 800 USD per ton, which is 40 cents per pound.
There were 100 24 milligram capsules in the bottles at the first website, which is 2.4 grams per bottle.
A pound of material would produce over 200 bottles.
So, 200 bottles of the stuff contains 40 cents of raw material.
I'd say that would allow a pretty good profit margin.
If I wanted some, I would look on ebay for a chunk of it, and just chip off little pieces of it and grind it in a mortar on an as-needed basis, maybe put it in a capsule or a milkshake. But, I'm not a fan of zeolites. To each their own.