If you're looking to sell your $30 Play Store gift card, there are several options available. One common way is through online marketplaces. These platforms allow you to list your gift card for sale and connect with potential buyers. You need to create an account, provide details about the gift card, and set a price. However, be cautious when using such platforms as there may be risks involved, like dealing with scammers.

Another option is to try selling it to friends or acquaintances. They might be interested in purchasing the gift card, especially if they are regular users of the Play Store. This can be a more straightforward and trusted way of selling, as you know the person you're dealing with. Just make sure to agree on a fair price and the terms of the sale clearly.
Some local classified ads websites can also be a place to sell your gift card. You can post an ad describing the gift card and your asking price. Local buyers may prefer this option as it may be more convenient for them to complete the transaction in person. But again, exercise due diligence to ensure a safe and legitimate sale.