It's crazy that there's so much disparity. :-/ Here (part of metro Phoenix area) I would say about 30% are wearing a mask in big stores like Wal-mart, Target, and other grocery stores, while almost all employees are in businesses I've been in. I haven't personally seen anyone giving anyone else grief for either wearing or not wearing a mask. There are only a few places requiring masks, like Costco and Living Spaces. There were a large handful of stores requiring them at the mall the other day, which makes more sense to me, since quarters are so tight in many of those stores.