http://www.domaincentral.com.au/
This is the cheapest I have found so far for what I needed, so definately check it out.
http://www.cheapdomains.com.au/
I bought a domain name from here, thought I would list it because it was cheap at the time, and I didn’t know about the next website I will blog about.
I listed it anyway because prices change, and they have become cheaper since I bought mine, and maybe they’ll be cheaper again in the future… who know’s?!
http://www.cheapdomain.com.au/
Check out the prices here, different sites naturally have different prices for each domain name extension and maybe this has a cheap one for what you are after.