I'm guessing the member was referring to a special sale as she specifically stated that the price was "today". I've often seen grocery stores - upscale and discount alike - will have 1 or 2 day only sales for select items that are deeply discounted. These are known as "loss leaders" .. shoppers are lured into the store by the sale item(s) but almost always end up making other more expensive purchases. Win-win. Customer gets cheap eggs, store recoups losses by selling lots of bacon and sausages to go with those eggs.