When you have an Xbox card worth 200 and are looking to sell it, there are several options available.

One place to consider is online marketplaces. These platforms often have a wide range of users interested in buying and selling various items. You can create a detailed listing of your Xbox card, including its value, expiration date if applicable, and any other relevant details. Make sure to follow the platform's rules and guidelines for selling to ensure a smooth transaction.

Another option is to check with local gaming stores or hobby shops. Some of them might be willing to buy Xbox cards from customers. They could use these cards for their own inventory or to trade with other collectors. It's a good idea to call ahead and inquire about their interest in purchasing such cards and to find out what their buying process is like.

You could also try reaching out to gaming communities or forums. There are likely individuals within these groups who are interested in buying Xbox cards. Posting about your 200 - value card in relevant sections of the community can attract potential buyers. Just be cautious and verify the identity and credibility of the person you're dealing with to avoid any scams.