Mike,
Posted again under Brand Roundup. There are at least 3 vendors still selling Listeroids in the US. Mike Monteith (listeroidsusa1) has done testing of the GM-90 and has had them certified for US sales (he's also selling mini-listeroids). Sam Crosby in Maine sells on ebay, (either Metro or Metex, I don't recall which, search for slow speed diesel engines). There is also a company from Texas, of which I know nothing. I'm sure there are others, but I'm not currently searching.
Ray
PS - Just looked at
http://www.oldstylelisters.com, as Mike suggested. Very interesting site, worth the extra $??, I couldn't say, how fat is your bank account?
I am personally impressed that anyone could offer 5,000, 25,000, 50,000 or 100,000 hour engines. A 100,000 hour engine would run 24/7 for 11.4 years (theoretically at least). How does a guarantee for such an engine work? If it only lasts 50,000 hours do you get half your money back? Non-the-less, pretty impressive.
Most Listeroid owners (I include myself here) are basically cheapskates. A cool, antique-design engine for ~$1000+ or so? Count me in! As the costs creep toward ~$2000+ for a basic engine, other alternatives start looking more attractive. Wherever you buy it, check shipping - it's expensive to ship 800-1000#'s of cast iron any distance. The cool factor can't be ignored, but, it all depends.