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Go to Amazon’s Seller Central site to sign up for a third party seller account. Fill out the registration form with your name, email address, and unique login password. Once your account has been activated, you’ll be able to sell your used items on Amazon. You may also be asked to provide some basic financial information, such as your debit card or bank account number. From your Amazon seller account, highlight the “Inventory” tab at the top of the page and click the option to “Add a Product.” Enter the bar code found on the back of the DVD to generate a unique listing for the item. You can also search for the DVD by title and select it from a list. When searching by title, be sure to choose the correct version of the item. If you’re selling a copy of The Matrix, for instance, you’ll want to specify whether it’s the standard theatrical version or 2-disc Special Edition. You'll be given a few different options to choose from, including “New,” “Used - Good,” and “Used - Acceptable.” Click the option that most accurately describes the item you’re selling so that potential buyers will have an idea of what to expect.  A basic condition designation should be enough to paint a picture of an item that doesn't show any real wear and tear. Amazon has a very particular set of quality standards for the used items sold through their site. Make sure your DVDs meet the guidelines outlined in the "Help" section of the Amazon Seller Central website. After specifying a basic condition, make a note of any additional features that the seller might want to know about. This is a good chance to report examples of minor damage or incomplete packaging, such as “missing insert booklet” or “small crack near corner of case.” Be as specific as you want—buyers tend to appreciate transparency. Be honest about the condition of your DVDs. If you try to pass them off as better than they are, there’s a chance they could be rejected by Amazon’s Fulfillment specialists or reported by a disgruntled buyer. Try to come up with a number that reflects what the item is worth and is fair for both you and the buyer. For a brand new DVD that’s still in the packaging, you may be able to make back most of what you paid for it. Used titles, especially those that show wear and tear, are usually sold for a smaller percentage of the original purchase price.  If you’re not sure how to price your items, take a look at similar listings and aim to match the average asking price.  Keep in mind that the value of DVDs is steadily decreasing as they’re phased out and replaced by other formats like Blu-Ray and streaming video. Buyers may go with another seller if they think you’re asking too much.

Summary:
Register for an Amazon seller account. Create a listing for the DVD you want to sell. Select the item's condition from the options provided. Give a detailed description of the item's condition. Set a price for your listing.