We've been seeing these electronic tags on sale items at Walmart for the past few years. It's been a few months since the last time we were in the store, but last weekend we noticed ALL items now had small two-color OLED price tags on them. I don't know if that means we're just lucky enough to be one of the first to get the new tech, or that the chain had already started rolling them out well before the article, but they're definitely out there. I'd actually love to get ahold of some just to play with them, although seeing the prices of OLEDs on ebay makes me wonder how any store is saving money by using them.