I got us Costco memberships partly because it was having a really amazingly good deal on a gym membership, but also because it's meant to be good for diapers. But now we're thinking about cloth. You? I like Costco for things like my lactase pills, mouthwash, toilet paper/paper towels, things where the generic is perfectly fine and you know you're going to need to keep on using it till you die so you may as well buy it by the truckload.