Try posting a free wanted ad at LabX (or search the equipment listed). They have a dental category for used dental equipment. It's just like eBay but targeted to industry professionals. All you have to do is register first (it's free), then run your ad. You can get 240V. 60 Hz in 'The States'. Equipment designated 220V. 50/60 hz. will work just fine. Equipment not listed for 60 hz needs to be evaluated on an item by item basis.
