Aquarium shops in Sydney, Australia

i own two bettas atm and i find it VERY hard to find stores that have a good selection of plants and/or fish. I'm looking to add a couple tank mates and turn it into a NPT over the summer.
(Kind of) Close by I have a PetBarn (wetherill park) which usually has a few plants, but not many fish and a couple local stores that stock varies and changes a lot (mainly in cabra-vale). However, none of these places seem to have any real idea on how to keep fish (well) or know anything about aquatic plants. Does anyone know of any good stores in the western sydney area?