They’re physically printed tags. Of course, in an ideal world, they’d do this but the chap explained to me it would take too long as they fluctuate daily.
The shops will likely be tracking online prices daily using a programme and updating them to ensue they’re competitive. This is how online businesses work. (I know because I’ve work with lots of them)
I just don’t get someone wandering around a shop and not stopping someone and asking a question, especially if I wanted to buy an item.