there are plenty of medical grade regulated ac/dc convertors on ebay, some very substantial. I have used them for turntable supplies and they work very well.
Custom Power Supply for 6v DC Motor
I'm trying to find a more substantial power supply to replace the wall wart that came with my Amazon Model Two. I need a 6v ac/dc converter. Anyone know a source for something like this? Or someone that could make me one? I can get a Black Lightening from Red Wine Audio but that's $1000 plus. I'd be willing to spend half that.