Costco rocks, especially if you've got kids. They've got pretty much everything you'd ever need -- from groceries to booze to hardware -- and the prices are always good and your shopping extravaganza is finished in one stop. Sure, you might find better deals if you shop all the sales, but who's got time. I like knowing that I can come here, get whatever I need, and not worry about getting ripped off.
Pros: Always decent prices
Cons: Jammed on weekends
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