If you want to support Aussie sellers then you have to take some of your own initiative and not just rely on Best Match or even when clicking Australia Only. Just have a keen eye and see if you can determine that they are indeed an Aussie seller. Then they may get your $. It doesn't really matter if the layout of the site is similar to one from overseas if you follow some simple steps. eBay's actually introducing a new postcode feature to help identify the country of sellers on any given eBay site.