Google's shopping search tool has long been on the extensive list of Google features which haven't been available to Australian users. That changed yesterday, with Google adding 'Shopping' to the list of refinement filters for Google.com.au results and automatically showing results from Australian retailers.
Depending on the product category, once you've performed an initial search you'll also be able to refine your results by price, brand, retailer and other attributes. It's certainly not infallible — for some gadget-related searches, obvious relevant products were missing — but it's an additional arsenal to bear in mind alongside more specialised search sites and bargain forums.
You can access Google Shopping through the link below, or by clicking on 'Shopping' in the left hand column of a Google search results page. As always, we're eager to hear how useful (or otherwise) you find it in the comments.