I just spent half an hour looking at every auDA Accredited Registrar's website, looking at how much it costs to register a .com.au domain.
Sometimes they actually listed prices, but often the easiest way was to just search for a random domain and wait for them to tell me what it would cost. It's just a quick survey, and it's quite possible that I got some of them wrong. All the prices should be for 2 years, but I didn't read the fine print too carefully. I expect some of the URLs won't work without the POST data, but they're really only there as hints for the auDA list.
login before price
TOC before price