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Enter your email to receive email and other commercial electronic messages about the latest news, promotions, special offers and other information from costco, regarding costco, its affiliates and selected partners. If you are inquiring about a price adjustment for a recently purchased item on costco.com now on sale, please fill out our price adjustment form for your credit request. Reviews for costco customer service (34) honest employee. Read a message from our ceo about small parcel delivery delays.