DH is a little too enamored of Costco, in my opinion.
We just got back with over $300!! worth of stuff. And we didn't even buy anything particularly expensive like a tv or anything -- it was all just food. I know they have some good deals but it always seems like we end up throwing away a lot of food which makes me wonder if it really is a good deal in the end.
We almost always get our TVs and computers there because they do have a great tech service and warranties. And, DH drinks a lot of soda so he buys it in cases from there. Plus things like paper towels, etc.
Do you shop at any of the warehouse stores? What do you like to buy there?