only through Amazon at this stage, but I am not sure if they will ship this to Australia - not all Amazon can be shipped internationally.
For the techies: If you have ever had your own idea for a custom item that fits your LEGO (like this case) then you should go to this link (http://blog.smallworks.com/ especially then scroll down to their December 13 entry where they show the actual molding process. They also discuss the problems of uneven cooling of the hot ABS plastic within the mold and show an AutoDesk animation of this hot plastic flow!)