Excerpt from TGA website:
There are two main ways to obtain nicotine vaping products if your doctor gives you a prescription:
filling your prescription at a pharmacy (either a physical community pharmacy or an Australian online pharmacy)
importing from overseas websites using the Personal Importation Scheme.
Be aware that apart from pharmacies dispensing nicotine vaping products to patients with a prescription, it is illegal for any other retailers, including vape stores, in Australia to sell nicotine vaping products.
Steps involved in legal access of nicotine products for vaping:
For more information, please visit https://www.tga.gov.au/nicotine-vaping-products-information-consumers