The opening of the new Costco store on Overlea Blvd. cannot be far off. Thursday the public was invited by signage on the street to drive into the new parking lot and pay for a membership to the club. “Avoid the rush,” say the signs. Those who do this should look for a white trailer behind the construction trailer off the main drive into the lot. It’s not especially obvious. But it is there and they will gladly sign you up.