He has diversion loads and blocking diodes and some low power Chinese alternators ($99 each) for 12 volt homebrew projects. Contact him for more details. I can’t comment on whether you will get a good deal or not.
Here in the UK I know of a guy Russell Evans (Mobile – 07456 976374) who is selling an altenrator that he cannot use for some reason. The Alternator is a Ginlong GL-PMG-1000 1kW alternator for grid tied application. It can do 1kW at 450 rpm. Drive plate included. It needs blades though. Big ones I would suggest.
I cannot vouch for either of these people but I pass on their offers for you to negotiate directly as you see fit. Just thought I would oblige them by letting folks know about the stuff they have on offer.