I found an interesting one here... they make both water oxonators and room air ozonators. Do these look like the dual dielectric type to you? I don't know that much about this stuff. The water ozonator (XT-301) is interesting... has a higher output and isn't much more (cost-wise) than a lot of the others I've seen. Looks like it has good quality parts in the air pump, too. It says it puts out 300 mg/hr. Has anyone tried one of these?
Scroll down on the left to where it says "Ozone water purifiers"