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Dynamic pricing could be coming to your local supermarket
(www.abc.net.au)
This is a most excellent place for technology news and articles.
My experience is they give it to you for ticket price and then immediately go and take away the incorrect ticket before someone else does the same. (Otherwise this would be false advertising and ACCC will fine them)
Yes, they have two options. Either honour the sticker price, or stop selling it at all until the price is fixed.