When you have a $100 Amazon gift card that you want to sell, there are several options available.

One place you can consider is online marketplaces. There are platforms where individuals list various items for sale, including Amazon gift cards. You can create a listing there, clearly stating the value of the gift card, its terms, and any relevant details. Be cautious when dealing with strangers on these platforms and make sure to follow the site's rules and safety guidelines to avoid fraud.
Another option is to look for local classified ads. Some local newspapers or community websites have sections for classified ads. You can post an ad there offering to sell your $100 Amazon gift card. This can be a good way to reach potential buyers in your local area who may prefer a more personal and in-person transaction.
However, it's important to note that selling Amazon gift cards may not always be straightforward. There are risks involved, such as the possibility of the gift card being redeemed before you receive payment or dealing with untrustworthy buyers. It's advisable to take precautions like only accepting secure payment methods and verifying the identity of the buyer as much as possible. Additionally, make sure to comply with any legal regulations regarding the sale of gift cards in your jurisdiction.