1. Buy at the cashier window: You can go to the cashier window and buy Australian dollar cash from the cashier. Usually the bank will charge a certain fee, and you need to consult the teller for the specific amount.

2. Purchase through online banking: If your bank has online banking function, you can use online banking to purchase Australian dollars, select the currency and transfer money directly. After the transfer is successful, you can choose to exchange money directly in online banking or in the bank teller window. Different banks' online banking operation methods and charges may be different.

3. Buy in a foreign exchange store: You can also buy Australian dollars in cash or wire transfer in financial institutions such as foreign exchange stores or travel agencies.