Email the parent company, in Italy, asking if they have a dealer/distirbutor in Australia. Sorry I couldnt be of more help. If there is a presence locally, Im sure one of the vendors (or more experienced members) should be able to point you towards them. Ive never come across the brand as Ive meandered through espresso machine stores. But I havent been looking for it.
Two stores that mention the Quick Mill brand in a google search are Coffee Company and Crown Coffee, both located in Melbourne. Crown have a page with two Quick Mill products and a PDF for each.