I just picked up a 8KW PMG from Tom at http://centralgagenerator.com/ http://shop.ebay.com/akatosborne/m.html?_trksid=p4340.l2562
He is the ONLY source I know of or have been able to find for 120/240 AC PMG generators in the US.
He said that due to increases in costs, he doesn't know how many more he will be able to get.
If you have any interest in getting one, waiting to get one 'later' would be like waiting to get a Listeroid several years ago........