To me they are not that expensive when you consider they are a one time purchase. Sota seems to make the best blood cleanser- Colloidal Silver maker. ZBB5. Very conveniant when used on one arm.
I would get a 9 volt 500 mA AC Adapter if you are going to use it for Colloidal Silver . I only use mine for blood cleansing. I use a Silver Puppy for the Silver.
You also need a magnetic pulse generator for getting at areas in the lymph and organs.