I also forgot to add www.staticice.com.au, this is a great site. You basically type in what you are looking for and it will show you the 20 cheapest prices for that item (that the site knows of) Australia wide. You can even make the search more specific by restricting the search to a single state and by adding more info on the item.
EDIT: Make sure you click on the price not the URL, the URL takes you to the site and you have to look for the product. In most cases clicking the price will take you to the product.