Displaying the price you will pay at the counter is my personal benchmark for civilized society. No price tags? You're a medieval backwater. Wrong price tags? Go see a shrink, USA. Correct price tags is the way to go.
It's weird here too because states set sales taxes. I live in Oregon, and we don't have a standard sales tax here. That means what you see is what you pay at the register for most things, and it's so freaking nice.
About the only thing I regularly see is the bottle tax (0.10/can added at the register). That's refundable too, at least theoretically, so it's not that bad.
Would it change your assessment if they have dynamic price tags that you can only see with the aid of some network-connected augmented reality solution or an online catalog (that you access with a QR code you scan, geotagged software, or something along those lines)?