https://amzn.to/4ev5gXb -18-24 year olds and students can get a Free 6 month trial of Prime for free. They also get 5% back on qualifying purchases.
Make sure you cancel before the 6 months ends. Once you cancel they let you finish your trial period.
-Amazon also has a special for Prime Day (June 23-26). where Young Adult accounts will get 10% back instead of the regular 5% back.