Boomerang can register your domain name for you.
Your site location will be www.yourname.com.au or can be www.yourname.com
Other domain types are available for non-commercial type organisations.

com.au - a commercial site in Australia*
             $55.00 per year if we host your site (else $80)

.com - a commercial site without any particular country of origin but usually U.S.
           $50.00 per year