Various banks offering currency exchange in Sydney include the Commonwealth Bank of Australia, Bank of Sydney, Westpac, and ANZ Bank.
Exchange bureaus like Travel Money Oz, Travelex, Foreign Xchange, etc. offer currency exchange in Sydney at competitive rates.
Platforms such as TransferWise, Xoom, and OFX allow for digital currency exchange at favourable rates.
ATMs have a wide network at various marketplaces, shopping centres, hotels and restaurants that allow easy exchange.