To use public transport in Sydney, you need an Opal card or a contactless payment method. You can get an "Adult" or "Child/Youth" Opal card over the counter at thousands of retailers, including convenience stores (like 7-Eleven or EzyMart), newsagents, and major supermarkets. There is no fee for the card itself, but you must "load" it with a minimum value (usually $10–$20) at the time of purchase. For most tourists in 2026, the easiest method is to simply "Tap on and Tap off" using your own contactless credit or debit card (or a digital wallet on your phone/watch). This gives you the same "Opal" benefits, including daily and weekly fare caps, without the need to find a store or manage a separate card balance. If you are a senior or student, however, you must apply for a specific "Concession" Opal card online in advance, as these require proof of eligibility and cannot be bought over the counter.