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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.
Not quite the same thing, but I used an LLM to cobble together a HTML file that allows me to search for products on Coles, Woolies, Aldi and Amazon at the same time in the same window (via frames and a Firefox extension to get around some security settings).
Works a treat when planning our big shops for the week, and has already saved us hundreds of dollars since Jan.