Australia is such a beautiful place and you would be taking a trip of a lifetime in order to go there. The problem is that the airfare is very expensive. If you could find cheap airfare then you would be more inclined to go. So, that is what you need to do. You have to start with choosing the time of year you want to go. A good tip to remember is that the airfare is less expensive when you travel off peak. So you would have to go when Australia is not so warm. You may want to go there in September, October and November when the temperatures are cooler or you can try in March, April and May which is their fall.
If you travel in the summer and spring months, the airfare will definitely be more expensive. You can try to get cheaper airfare through a travel agent; they may have better deals then the actual airline. Or you can try places online like Expedia, Travelocity and Orbitz who claim they can offer cheaper airfare. You may also get a cheaper airfare if you travel to the less popular parts of the country. Once to you get there you can travel from within.