I have had some time to do some checking and found that just doing a search for "ultrasonic foggers" brings up many places to buy these. They seem to resemble the foggers that you can get around Halloween time although I am not sure if those are actually ultrasonic or not, and/or the difference, but the ones that say they are ultrasonic are not bad in price. Thanks for the leads, and if anyone is using them let us know how they work (pro's and con's etc).
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