Didn't realise but apparently the price cards aren't paper anymore, they're e-ink now. Saw one change in front of my eyes and I thought I was seeing things! Must be some sort of dynamic pricing thing they do so that they're always cheaper than whoever is cheapest or something.
That sounds like it kinda sucks. Imagine something is on sale and it just ends as you pick it up. You cant even tell the sales people what the sale price is since now the display changed...