Well, after not shopping since mid-March, yesterday I went with my husband to Sam's Club and Costco, we both wore masks and gloves. At Sam's, the majority of the customers wore masks, just a few inconsiderate people in the store who didn't.
At Costco, masks were mandatory, which was a good thing, makes sense right now. They had a cop and a store manager/employee at the entrance, where you couldn't even walk into the lobby without showing your card and wearing your mask. They were both very nice and thankful to all who entered, and they both wore masks. Coming out, we noticed there was just a small incident before we exited, a man who obviously refused to wear a mask was refused entrance into the store and was angrily walking back to his vehicle. Nice to have a cop there in case anyone gets smart, and nice not to have incidents happen inside the store, putting customers at risk.
All in all it was a good day, no lines to wait on, people were respectful of each other and kept their distance, store wasn't too crowded and things went smooth.