I live in an area with probably close to 50% vaccinated, so should be a similar average in a large store. I saw the Costco sign and walked in without a mask on a busy afternoon. (Hundreds of people) Spent about 1/2 hour in the store, and counted exactly 5 other people without masks. 1 woman worker, one elderly lady and 3 men who looked to be 50s or older. We all nodded and smiled at each other. I suspect only the worker had taken the "jab."