In slightly related news:
Do not use MelbourneIT or Crazy Domains.
MelbourneIT are notorious for being terrible, but there glad to take your money.
Crazy domains doesn't really have a good name for itself.
See:
http://forums.whirlpool.net.au/forum...s.cfm?t=832887
Also if you plan on getting hosting to use with your domain, do not register them together. AKA if you use Ventraip for hosting, register the domain elsewhere. Will save you a lot of hassles if you decide to move hosting providers (among other things).
Domains are cheap for a .com/.net etc. Around $8/yr or so.
.com.au are more expensive and generally require some proof of business - and the domain must relate in some form to your business name. So you can't have waivingflailinginflatabletubeman.co m.au if your business sells cats and dogs.
There are a ton of name providers out there, i personally use Namecheap and have not had any issues. I do not recommend godaddy.com, but that is a personal thing as i dislike decisions the company has made.
https://www.namecheap.com/