> It probably depends on what you mean by "grocery store." In dense urban areas, bodegas, chain convenience stores, and pharmacies with a small grocery section are pretty plentiful. Supermarkets a lot less so. That's probably part of a shift over time. In general, we probably have more relatively large but spread out businesses than little mom and pop places on every corner. (This is sort of a US comment. There seem to be more serviceable smallish grocery stores in Europe that are in between a supermarket and a convenience sore. That's less common in the US other than one-off markets.)

While on a business trip I stopped at a petrol (gas) station in the UK a couple of weeks ago, the sort on the side of a major road outside a city, and with a mini-supermarket attached, and was literally speechless when I realised they had a whole shelf rack containing gluten-free products.

I have coeliac disease, and had been assuming I'd have to travel specially to some large supermarket to get the stuff I can eat, but thanks to this place I grabbed loaf of gluten-free bread and a pack of gluten-free cornflakes, and I was good to go.

I'm discovering that coeliac and mid-range hotels don't always mix :/