Sam's Club makes it easy to stock up on your favorite brands of disposable diapers, including Huggies, Pampers and Luvs. Want to shop for disposable diapers by size? Sizes range from newborn baby diapers up to size 7. Since diapers are one thing you never want to run out of, consider buying in bulk or signing up for a diaper subscription and having them shipped to you regularly. Look to Sam's Club for all your diaper needs.