Lighthouse at Bondi Rd
Vision Imagelab at Danks St, Waterloo
Blanco Negro at Alexandria (B&W only)
Foto Riesel, Kent St, City (Leica, Canon, Voigtlander & lots of 2nd hand gear)
Mainline at Crows Nest (mainline.com.au)
Ted's, Pitt St City is also a good option for buying film
Vanbar at Camperdown is probably the best place to buy film & other supplies such as developer etc
There is a camera fair every few months at Ultimo Community Centre, next one should be soon. You can see the ad in the latest issue of Photographic Trader magazine, which is probably the best resource for second hand photo & cine gear Australia wide. available at most newsagents.
There is a second hand camera shop at Kings Cross, Victoria St, called Grace's but their prices are outrageous.
A good source for motion picture film is the Sound & Vision Stock Shop at Artarmon. They are Kodak distributors & seem to have the best prices.