What a curious thing for the ASNSW to say! Not for profit? What's that to do with anything? How does that preclude you using their services & facilities???
Ask the MacArthur Astro Society. Their dark site is at the Belanglo, but they have a closer site Camden way:
http://www.macastro.org.au/home/
The Sutherland Astro Society is another you may like to contact:
http://www.sasi.net.au/ . They too have a couple of sites.