Definitely not a “local” store, but REI does sell them. They’re aren’t always in stores, though, so you’d either want to call ahead or order online to pick it up
REI only sells the simple pad. If you are looking for a big pad or some other variety, your best bet would probably calling local gyms. Lots of gyms have gear shops now and they tend to have a small selection of organic pads.
I have made the pilgrimage to Planet Granite Sunnyvale at a time when the boulders were getting scary. I called all around to many gyms before taking the trip. The sunnyvale gym has so many pads from the big to both the full and pro. Lots of color ways as well. IDK if they're open or perhaps maybe just their proshop is. Best of luck to you.