The Scanning Code of Practice is a voluntary code that certain stores (including Woolworths, Coles, some IGA’s, and Aldi) have signed up to, where if an item scans higher than what the shelf price says, the customer is entitled to receive the first item for free, and any subsequent identical items at the lower price. This means that if you have two similar items scan higher than the shelf price, such as two packets of chips that are different flavours, both would be free, as they are not identical.
