You can get them but most shops buy normal finned angelfish because they are cheaper and usually do better than the long finned varieties. If your local pet shop doesn't carry them, ask if they can get some in for you. You usually have to leave a deposit and it could be a few months before they come in, but the shops can order them in if you really want them.
The following links are for the 2 main importers/ wholesalers of freshwater aquarium fish in Australia. They sell to most shops around the country. Other shops also import fish and in Perth, Vebas Aquarium in O'Connor, and Aquotix in Canningvale both import fish and sell to the public. A few other shops do as well.
Each week, Aquarium Industries posts a list of the stock that we currently have available for order on our website as a downloadable excel file.
Listing of LIVE FISH products