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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.
High traffic area, common product that sees a lot of people. You could get 2-3 in a trip without much worry. Do it every few visits. Get a few additional people to do it with the same plan. If you notice more security, just move on, force them to give up or water a bunch of money. Leave reviews of the store how you don't like the extra security/cameras. Your a customer not a criminal! Call out the management...
You don't have to win in a day, but an expensive, annoying, psychological warfare approach... That and going after them on social media.