Amazon built their own in-house logistics network because UPS et al. weren’t cutting it. They offer one-hour delivery for a lot of basic items where I am and it’s not even a particularly urban area. I think in urban centers those same items have 15 minute delivery. They are also the only ones who will consistently deliver on Sunday, when your local store might not even be open.

There are still lots of good reasons to shop local, but I’m not sure speed is the best reason.