I have a Plasmafire Beta II that I haven't used in several years, packed up in a box with all attachments. I paid $1800 for it around 2001. I'd sell it for $500 with free shipping to the USA lower 48 states. I'm going to list it on eBay one of these days.

I think Plasmafire and Longevity Resources are the top medical grade ozonator products, although there may be another company in there as well. I used to have a Longevity Resources, medical grade ozonator, and it was a great product. They have great customer support as well. I recommend a medical grade ozonator if you want top-of-the-line.