Here in PA some of the stores have it right at the front counter. Neatly placed in 3 wicker baskets about 2-3 ft high. Can't miss it when checking out!
I've never even heard of Prosecco until I saw CB promoting her brand. Perhaps some stores can't keep it on the shelves fast enough and others might be moving a little slower. It's the beginning. The fact that we are even at at Binney's is amazing. It's only going to get better.