Try
www.cameras.net.au/secondhand.php - if you talk to them, Bruce or Phil, tell them you know me and it's for Astro-photos. They're good guys. I've bought and sold a lot of stuff through them.
Second hand camera shops will be delighted to get rid of old film camera bodies. They should be a dime a dozen. Remember, the older the better. Less to go wrong or get a cold battery.