I have a friend with an E12M for sale, it's listed on Craigslist in Falmouth, Massachusetts.
Quick facts:
Bought from the original owner 7 years ago.
Electric Motor and gears work well
Mower deck works but shows its age and will need some sheet metal repair.
Has a new Soneil charger model #3624S R16 36volt 10amp
Has six 6volt batteries - 4 of the batteries are in decent shape, 2 batteries in poor shape
Original tires in good shape
They are asking $600, but I suspect that they might take less.
Thanks