Price applies to new domain name registrations only, and excludes premium domain names. Minimum registration period for Australian domain names is two years, with renewals charged at $49 for two years. All other domain names renewals are charged at $24.50 per year.
i think it is quite cheap for first two years of .com.au registration.
pity i cant register .com.au
registering an abn seems to be a hassle.