Here in San Jose, I always see masks at stores because almost all of them have signs saying you can't enter without one.
The exception is parks, I went to a park once and I saw almost no one with a mask. Originally, the city flipped over all the picnic tables and put signs and caution tape on them saying that they are not to be used because of social distancing but I saw about half of them flipped over and occupied by white people. I'm not trying to be racist, but it's what you would expect...
I have no idea where people got masks from, I know some stores started giving them out to shoppers who didn't have one but I don't know if you needed to buy it or if it was free. Personally, I've had an N95 from a year ago during the wildfires that my work gave out and that's all I've been using for almost 4 months. I have a bunch of extras I got from my brother who works in a hospital though. How often are you supposed to switch them out or "bake" them?