Generally, most buyers will opt for a dedicated crypto broker or head directly online to an exchange. There are many exchanges that offer Ethereum for sale, and your first question should be whether it accepts Australian currency. Then you should look at fees for buying and selling ETH, the interface of the site, user reviews, and security. Any exchanges that are listed with government agency AUSTRAC may offer heightened checks and balances. You may also want to check whether you can withdraw Ethereum from the chosen exchange to store in your own wallet. And, of course, you should  make sure you’re aware of the risks of buying cryptocurrency in the first place.