We recently had a Costco open where I live. I was really surprised how much of the offerings are gluten free or no nitrates. Most of the sausages and processed meats had at least some variety of no nitrate version. They had GF baking mix and a decent selection of alternative grains. Lots of things were labeled gluten free that I wouldn't assume to have it so it may be part marketing but might matter more to someone who really has to watch their potential intake.