Buying vitamins at Costco, will save you money. Costco's store brand is called Kirkland. They are just as good, as the name brand vitamins. You will get more and save money, from buying a store brand product.
I would suggest never to buy vitamins from a chain store. Their very cheapness is the reason. If you are going to buy vitamins buy good quality. Learn about how to get and stay healthy and relatively inexpensively. By the way, our bodies need 16 vitamins, something like 74 minerals, 12 amino acids and 3 essential fatty acids each day for optimum health. Is it any wonder people are sick. The point is we all have to take charge of your health as you appear to be doing as no one else will. One web site that has helped me is www.Mercola.com packed with good Info. Stay well my friend!