I used to work at Best Buy replacing pricing stickers before the store opened. We had a sheet of new stickers for changed prices every time and had to scan every sticker in the store to make sure they were all up to date.

It makes sense they’re all switching to e-ink tags though, probably saves a ton in labor and the occasional mistake.

That's because those stickers constitute an offer of sale for a given price. If a customer comes in, takes the item, throws down the cash to an employee and leaves, that's a 100% bone fide legal sale.

That's also why messing with price stickers is a crime.