Well Tower sell/sold magnums, and the last I checked they show the Magnum 91 as being discontinued. You can still get the ASP which is the Magnum counterpart from Hobby King. I do know that when you buy a Saito you do get a high quality engine, all of mine that were taken care of are good strong runners, all but one I bought used, all but one were taken care of, and the one just needed bearings. The one I did buy new is the FG-11 and it is a very good engine, but is it worth the cost? Finding a good reliable four stroke gas engine is not easy. I do feel the OS engines are over priced, the ones I have don't run as reliably as the Saitos do and are a bit under powered when compared.