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Amazon needs little introduction. The long established etailer has depth in multiple departments whether you are shopping for DVDs, videos, books, music, videogames or electronics (flat screens, HD cams, etc.).
Unless you are making very small orders, you can usually qualify for free postage in the U.K.
Amazon also operates as a marketplace for other sellers, meaning that you can often pick up secondhand goods at much prices that are much cheaper than new.