Margie - some of the ultrasonic polishers are modestly priced - for
Mini-Sonic Tumbler at Rio Grande
but I would offer this observation - by themselves, my experience is
that their utility is limited. They are great for takein cleanup,
When coupled with Diamond Pacific 50,000 diamond dry media, they do a
nice job of final polish for jewelry even with stones set. I
personally don't like how they move steel but my friend Judy
Willingham uses this machine for burnishing and likes it.
Other dry media than the one referenced don't work so well.
So - while there are very expensive ultrasonic machines in the tens
of thousands of dollars, there are also some not so expensive.
Look at the range of tumblers - vibratory and rotary and the
associated media. There are lots of choices, all individual to what
kind of work you do.
Judy Hoch, G.G.