Pat,
I have bought many at the Wholesale Medical Supply for $ 40.00 each.
They are not ultrasonic and work very well.
Now I have an Omron Ultrasonic and cannot tell that much difference.
Some say Walmart had them at one time.
I think you can make one from a two bit Air Brush.
Fact is, I doubt that any of them are worthless and they all work to some
degree.
Wayne
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