If you have an Amazon card worth $30 and are looking to sell it, there are several options available.

One option is to consider online marketplaces. There are platforms where individuals can list items for sale, including gift cards. You can create an account on these marketplaces, provide details about the Amazon card such as its value and expiration date, and set a price at which you want to sell it. However, be cautious when using such platforms as there may be risks involved, like dealing with scammers. Make sure to read the platform's terms and conditions carefully and follow their guidelines for selling gift cards.
Another possibility is to approach local pawnshops or second - hand stores. Some of them may be willing to buy Amazon cards. You can visit a few nearby ones, explain that you want to sell your $30 Amazon card, and see if they are interested. They might offer you a price based on their assessment of the card's value and their own business needs. But keep in mind that they may offer a lower amount than the full $30 value.
You could also try asking friends or family if they are interested in buying the Amazon card. Maybe someone you know needs to make a purchase on Amazon and would be willing to pay you the face value of the card in exchange for it. This can be a convenient option as it avoids dealing with strangers or potential risks associated with online or other selling methods. It also helps maintain a level of trust as you are selling to someone you are familiar with.