Costco is a wholesale retailer which originated in Kirkland, Washington (thus why all Costco brand items are Kirkland Signature brand).  It is the fourth largest general retailer in the United States behind 1)Walmart 2)The Home Depot and 3)Kroger. 

The reason why Costco is so cheap is because they send in bulk, at wholesale price. Furthermore, Costco does not always carry different options for similar products (as you would find at most grocery stores).  Costco really gives you the bare bones - the product (and only one option at that), and no to carry your purchases out.

Currently, the Costco annual membership fee is $50 which includes two membership cards.  Costco only accepts checks, debit cards and American Express.

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