To be clear, the poster that said "$400 ultra-sonics..." is correct. I use them every day for medical uses and the cheap ones barely work, if you can call it that. The cheap ones do not actually have the mechanical parts to truly use sonic waves. However, a ggts isn't a medical grade instrument with blood and bodily fluids died to it. So a cheap one might do the trick, provided the correct detergent is used.
I agree. In your line of work this is very critical. For my purposes I love my $20 amazon ultra.