Sounds like reverse auctions. Rather than people competing to buy an item on sale, sellers would be bidding to sell a wanted item. Does anyone do this? Would it actually work?
yeah, and this idea has been tried for more than a decade in various forms. To make it work, having a twitter-like approach, with location included, and having stores actually using it, that would take off (potentially). The diff now from 1999 is tech is cheaper, more pervasive, and mobile.