Probably worth checking in w/ the motorhome service groups for parts too...also keep your eyes peeled for dead/dying motorhomes equipped w/ the Hone-O units..
Here's a San-Fran craiglist example from Sept..
http://sfbay.listpic.com/sby/rvs/4253269...santa_cruz.html
For a g-note it sounds like it's worth pursuing for the Hone-O alone plus a chance to get dough back on the Onan generator, 'rubbercrank' 440 and other goodies...and some aluminum to cash in at the end of the day too?.
~ Pete