You need to look to...
a) contract law
b) Trade Practices Act
The provision referenced by spell check (s 74) is useful to you.
However, contractually there is no contract until the offer is made by the PURCHASER, which is accepted by the VENDOR in forming the contract.
The only way you will be able to recover damages in these circumstances is if there was no reason to believe, at the time of advertising, the vendor would be able to offer the goods/services at the listed price.
All they then have to show is that some circumstance changed, their supply ran short, their supplier called them and changed the price, etc. and they are not liable.
Basically, if they advertise the wrong price by reasonable grounds - you're not going to get anywhere in a legal battle. You can only get anywhere if they unconscionably sought to attract customers by offering a price obviously below what they ever intended to sell the good for - i doubt that this is the case, but if it is, good luck to you.
(don't consider this to be legal advice...blahblah disclaimer I'm not a lawyer)
lissamaher said:
Oh course there is, that is misleading advertising, and they are obligied to give it to you for either the advertised price, or free.
That isn't the case at all - that may be the policy of some stores like Coles that are more concerned with your business than the price of a single good.