Hi Tanya,
to ATP!
Many rose lovers use HelpMeFind.com for resource listing.
http://www.helpmefind.com/rose...
I entered 'Tanya' in the search and here is the entry
http://www.helpmefind.com/rose...
Clicking on the 'Buy From' tab only shows one vendor at first, but if you scroll down and click on the 'VIEW ALL NURSERIES SELLING THIS ROSE' it shows more vendors, and two are listed for Australia.
Hope either one of those will have that rose available for you.