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How would that even work? You don't ring it up when you take it off the shelf. They'd have to detect you at the register too, and set the same price. Most states require by law that if it rings up differently, they have to give you the lower of the two prices.
(But in my experience the person at the register says "ok what did it say on the shelf" and then rings it in at whatever price you say, though they probably won't do that if you say some absurd price.)
Start taking photos of price tags. Shopping trips will cost more in money or time.
self checkout at walmart has a real time camera feed of you at in the self checkout booth. they can just detect you there
How do they tie that to a detection at the shelf? Any shelf tag will have multiple people in range, as will the register, and there's no camera on the shelf tag. I suppose they could use the aisle security cameras, but I don't think they'd be able to use those to identify and track people for pricing.
it ain't hard to fingerprint with video. Wal mart could do it if they wanted to is all i'm saying. They have the infrastructure and the ability to pay the salaries for the engineers to make it happen. not saying they are, it just takes one ambitious VP and a senior manager to get the OKRs rolling though