Stick to your own ATM

It may seem like commonsense, and it is, but by not using out-of-network ATMs you can save between $3 and $5 a week, up to about $250 a year, a fee you are paying just to withdraw your money.  Better still avoid ATMs altogether and withdraw the cash you need for the week during an EFTPOS transaction (it may be  your petrol or groceries) and you won't get caught by mistake.