Hello I would suggest doing a search on google for B5. I know that the more quantity that you buy the better the price. I personally bought several dozen jars from a place called Swanson Health products. I don't know if they ship to Australia or not. The other thing you should know is that this stuff has a long shelf life. I believe it is 2-3 years or more. So you can buy a lot of it and not worry about it spoiling. I had Acne most of my young adult life also so I know how it truly sucks. Once you do clear up your skin it totally makes you appreciate life more than the average lucky person who never had pimples. Life is real good for me now that I am zit free!!