I have been a member of Costco for several years now and my wife and I love it! They have such a large variety of items for every room in the house, groceries, supplies, books, toys, clothing, garden items, tires and more! Often times we go just to browse aroundand see what's new - and the kids love the free food and drink samples they give out all the time.
We like to stock up on foods and household items that we use regularly. But you still have to be careful what you purchase, even in bulk. Sometimes Costco has a better deal and some times they don't! But, the fact of the matter is that shopping here is convenient and you can get it all in one stop. Often times that means more to me than getting a lower price or a better deal on an item. Time is money!
You can check out their website http://www.costco.com/ to get membership information and store information.