Went to my local Costco today and saw the following sign posted right next to the entrance door. When I called them just now, they said that corporate had all the stores put them up and it had been there for quite a while. I was there within the last couple of days and it was not there. I have always open carried and their own people even told me that they did not care as long as no one complained. And before anyone starts getting on my case about open carrying, the last couple of times, I was wearing a shirt over a LC9s. I also know that it is in the tiny fine print of the membership agreement that firearms are not allowed. So if you go to Costco, just be prepared to cover up if needed.