Australia uses different smart card systems for each major state, and you can get them at airports, train stations, and convenience stores (like 7-Eleven). In Sydney (New South Wales), you use the Opal card; in Melbourne (Victoria), it's the myki card; in Brisbane (Queensland), it's the go card; and in Perth, it's the SmartRider. However, in 2026, you often don't need a physical transport card at all in cities like Sydney and Brisbane, as you can simply "tap-on" and "tap-off" using your contactless credit/debit card or smartphone wallet (Apple Pay/Google Pay). If you prefer a physical card, you can buy one for a small deposit (usually around $5–$10 AUD) and "top it up" with credit at kiosks or via the respective city's transport app.