Foreign exchange is globally networked, and there won't be much difference. Whether it is cost-effective, mainly depends on what kind of exchange difference is given by the bank you exchange. But it's not cost-effective to change dollars into Australian dollars now. Now is a good time to change Australian dollars into dollars. Now it is about 0.89, and the normal exchange rate between the US dollar and the Australian dollar is generally around 0.75. If it is not particularly necessary, it is recommended not to change it for the time being.