Costco is a membership warehouse club that sells products to its members at lower-than-retail prices. Many items are sold in bulk quantities, like 18 rolls of paper towels or 36 rolls of toilet paper. The store sells many grocery items, including fresh produce, dairy, frozen food, packaged goods, cheese, bottled drinks, toiletries and pet food. It also carries office supplies, electronics, toys, books, videos, clothes and even furniture. There's a large selection of wines, an on-site bakery, a butcher, fresh flowers, an eye clinic and many pre-packaged meals and take-home foods. Costco has a gas station, liquor store and tire store on the premises, too.