Think there is some confusion here...
https://www.mwave.com.au/
Is an australian website, and I assume uses AUD (might want to send them an email). I have never purchased anything from them before. Have spoken with many people who have. They seem to be legit. Just in case you missed them some others Aussie websites:
https://www.pccasegear.com
In case you have an outlet near you.
http://www.msy.com.au/
Their website is ugly. I just download their pdf pricelist and give them a call to check stock levels etc. But usually won't find any cheaper and saves you a shipping charge
Even if you just get the case and PSU from them it will take a chunk out of your shipping $.