Check out the yellow covered "Photographic Trader" magazine from your local newsagent. There is also a camera market day at Ultimo Community Centre Bulwarra St Ultimo 10am-3pm Sunday 22 July. Mostly endless heaps of SLRs for sale but I have seen very attractive Nikon rangefinders there--rather more than $30, though! If you win the lottery soon Mainline at Crows Nest for Leicas and Voigtlanders.