Hi, I haven’t tried these methods, however, seems reasonable to suggest, Owners Corporation Network discussion group. http://www.ocn.org.au
There is also Australian Institute of Quantity Surveyors. Ph 02 8234 4000. Or simply try Yellow Pages directory, at http://www.yellowpages.com.au
ln my experience with anything like this, it will pay to collect research on your precise requirements ahead of any appointment. Best of luck!