They arent all that expensive. New can be had in the $100-$150 range, but price varies with size and power. Sometime if you are lucky you can find one on CL that was lab or industry based and has lots of power for cleaning. The one I bought is more powerful than a 'jewelry' cleaner, but definitely not as powerful as some of the bigger ones.
the one in the vid is roughly the same size as what my buddy had and his was $2K+