This is good value, especially if on an unpowered site at $5 per person ( I have previously stayed on a powered site, also good value).

http://www.principality-hutt-river.com/visitors/PHR_Camping.htm 

Scroll down on link below for map of area etc, two ways in;

http://www.principality-hutt-river.com/Principality%20Downloads/PHR%20Brochure.pdf