Last weekend, I was at a used books shop. I saw a guy with some iphone app, checking the price of <i>each and every</i> book in the shop (there were lots of books for $1). The store people noticed, but didn't say anything, at least I didn't see them say anything. I bet they weren't happy about it.<p>How long before we just place an order, online, in a centralized place, and pick one of these:<p>cheapest<p>fastest delivery<p>highest quality<p>or some combination of these, and the app finds the best place to order (amazon, walmart etc) and automatically places the order?