I like the idea of going natural and cheap also, which is why I'm considering: Modifilan, zeolite, the affordable liquid zeolite at docsprefer.com, chlorella.
The products recommended by Jim Carey's wife have a lot of testimonials, google "Generation Rescue". Many recommended products in the $100 price range.
I was just considering today purchasing some human-grade zeolite to eat w/ my food. Few testimonials though. Of course, one could go wild & try cat-litter, or aquarium filter zeolite, but that's a big gamble, cause I read that the toxic form of zeolite is often mixed in with the prufication form, but I would question just how toxic it is if it is used to filter fish water!