haggling
Bargaining is uncommon in Australian stores, though vendors are usually willing to meet or beat a quote or advertised price from a competing retailer. It's also worth asking for a "best price" for high-value goods or purchases involving several items. For example, it would not be unusual to get 10% off an item of jewelry that was not already reduced in price. The person you are dealing with may have limited authority to sell items at anything other than the marked price.
tipping
Tipping is never compulsory and is usually not expected in Australia. Staff are seen to be paid an appropriate wage and will certainly not chase you down for a tip. It is acceptable to pay the amount stated on the bill. When Australians do tip, it will often be in the form of leaving the change from a cash payment usually as a convenience so the change does not hang around loose on someone's person - not as a gratuity, rather than a fixed percentage.
In a suburban or country restaurant where table service is offered, they will certainly take a tip of 5%-10% should you decide to leave one, but it is almost always not expected, and locals usually do not leave any. In a cafe or more informal restaurant, even with table service, and even in tourist centres, leaving a tip is unusual. Sometimes there is a coin jar by the cashier labelled 'Tips', but more often than not, diners do not leave one.
Tipping is also not expected in taxis, and drivers will typically return your change to the last 5 cents, unless you indicate that they should round the fare to the nearest dollar it is not unusual for passengers to instruct the driver to round up to the next whole dollar.
tax
Australia has a sales tax known as the Goods and Services Tax or GST that applies to all goods and services except unprocessed foods, education and medical services. GST is always included in the price of any item you purchase rather than being added at the time of payment.
Receipts tax invoices will contain the GST amount, which is one eleventh of the total value of taxable supplies.
cash
Cash dispensing Automatic Teller Machines ATMs are available in almost every Australian town. Australian ATMs are deregulated and may impose a surcharge over what is charged by your bank or card issuer. The fees can vary between institutions and between locations, but are usually around $2. The ATM will display the charges and you will have the option to stop the transaction before you are charged. Check with your bank as to what additional fees they apply to withdrawals in Australia.
Dedicated currency exchange outlets are widely available in major cities, and banks can also exchange most non-restricted currencies. These exchange outlets - especially the ones at the airport - can charge 10% over the best exchange that can be obtained from shopping around. Australian banks usually offer an exchange rate around 2.5% from the current exchange midpoint. A flat commission of $5-8 can be charged on top. Some outlets advertise commission free exchange, usually accompanied by a worse rate of exchange. Don't assume every bank will offer the same exchange. A simple calculation will let you know what offers the best deal for amount you wish to exchange. There are vouchers for commission free exchange at American Express available in the tourist brochure at Sydney Airport.
There is also no need to arrive in Australia with cash if you have a Cirrus, Maestro, MasterCard or Visa card: international airport terminals will have multiple teller machines that can dispense Australian currency with just the fees imposed by your bank plus the ATM fee.
currency
Australian currency is known as the dollar, and the currency symbol is "$". There are 100 cents in every dollar. The dollar is called 'the Australian dollar' usually written as 'AUD' or A$ when it is necessary to distinguish it from other currencies. No other currency is accepted for transactions in Australia.
The coin denominations are 5c, 10c, 20c, 50c, $1 and $2. The note denominations are $5, $10, $20, $50 and $100. Australian notes are produced in plastic polymer rather than paper. If the total of a transaction is not a multiple of 5 cents the amount will be rounded to the nearest five cents if you are paying in cash. The exact amount will be charged if paying by card.
The dollar is not pegged to any other currency, and is highly traded on world foreign exchange markets, particularly by currency speculators. Its exchange value to other currencies can be quite volatile, and 1-2% changes in a day are a reasonably regular occurrences.
Money changers in Australia operate in a free market, and charge a range of flat commissions, percentage fees, undisclosed fees built into the exchange rate, and a combination of all three. Generally the best bet is to avoid airports and tourist centres when changing money, and use banks in major centres. Expect fees to vary considerably between institutions. Always get a quote before changing money.