We have costco and sam's club memberships, mostly for our business but I do most of the shopping for home there also.
I love there meat and produce and I love not worrying about getting things on sale at the grocery store, I always feel like costco has fair prices and I love their dog food, I feel like it is comparable to california natural at a fraction of the price. I get my gas there also.
I get a box of contacts for 15.99, my optometrist sells them for 35.00.