The massive Costco warehouse in Gaithersburg provides discount shopping to members only, with aisles upon aisles of fresh and packaged food, health & beauty items, household products, clothing, toys and electronics. Additionally, this location offers an in-store pharmacy, a photo department, optical and hearing departments, a bakery, a butcher, a florist, a food court and a tire service center. Membership sign-up is available in the store or online.