There's a big Amazon hub or distribution center (or whatever the proper word for it is) in town here and every once in a while I see them out with their little "robot" carts testing them in some of the neighborhoods around here. I haven't seen any drones yet. The little "robot" things look like little 6-wheeled tanks and the ones I've seen seem to crawl along at about 3 mph with someone following them with either some type of clipboard, radio controler, or tablet computer. Doesn't look very efficient to me, of course, I'm sure it's just experimental at this point but it looks like it's got a ways to go.