Hi,
The two places in WA that I know of are
http://nvt.com.au
http://www.btow.com.au/ (no online prices)
Also Andrews is offering free shipping in Australia at the moment.
http://www.andrewscom.com.au/site-section-10.htm
You definitely want to get one with the Crayfor focuser. You may also need a collimating tool.