I've used this camera for, I think, one roll. It's in great condition. Still has the plastic piece on the bottom. The lens has a little oil on it but the apertures are snappy after massaging them a little (the camera has sat for over a year).
For sale ($25+ shipping) or trade for 120 film Portra 160 / 400, others?)
I have one of these Mamiyas, and it's a very nice small camera that can produce excellent photographs. Lenses are available from 14mm fisheye to 200mm and perhaps beyond. S76 battery, so no issues there. At this price, a steal! Good luck with the sale!