For access to the full-text articles ask staff at the Reference Desk. The index numbers can provide you with reasonable estimates for prices of comparable items at different times given one known price for the item. Australia no longer has coinage below the 5c denomination. These are the components of the ABS 'Weighted Average of Eight Capital Cities index number for All Industry Groups' commonly accepted to be the Australian Consumer Price Index. For the determined inquirer however a systematic search for the actual price may be required and some of the following publications may be of assistance.
Some industry sectors publish regular price lists.
The State Library of South Australia has extensive holdings of these publications. Some pricing services are available through their Internet site. In many cases prices are regularly listed in the associations newsletter. It lists prices for batteries, biscuits, cakes, cordials, cigarette papers, razor blades, confectionery, frozen foods, milk drinks, etc. There does not appear to be a currently published listing of South Australian liquor prices but these are often found, along with petrol prices in the government's budget papers.