When you have a Google Play Card worth $200 and want to sell it, there are several options available. One place could be online marketplaces. There are various platforms where individuals list and trade such items. You can create a detailed listing about the Google Play Card, including its value, expiration date if applicable, and any terms associated with the sale. Make sure to follow the platform's rules and regulations regarding the sale of gift cards.

Another option is to look for local classified ads. In your local newspaper's classified section or on community-based classified websites, you can post an ad offering to sell your Google Play Card. This can be a good way to reach potential buyers in your immediate area who might prefer a more personal and local transaction.
You could also consider asking friends, family, or colleagues if they are interested in purchasing the Google Play Card. They may be looking for a convenient way to add funds to their Google Play accounts and would be happy to buy it from you at a mutually agreeable price. This can avoid the need to deal with strangers or the potential complications of online or local market transactions.