Australia is not known as the worlds cheapest country. In fact, just the opposite. Some people say it's because we're isolated down here, some say lack of competition, high wages or cost of shipping. Others say it's because we've always just paid more for things and think it's normal. More likely it's a combination of all of these.
Sometimes we have sales but they are usually crap. SAVE 1% WITH PURCHASE OF 50 OR MORE T-SHIRTS sort of thing. Once I saw something with a SALE $20 ticket over the original price, lifted the ticket up and found that the original price was $20.