Amazon is offering 50% off 6-Month Prime Subscription for Young Adults (18-24) for a limited time. Plus, get 10% Cash Back on Prime Big Day Deals and 5% Cash Back on everyday on eligible products for a limited time. for a limited time. Many of the benefits are the same as a regular Prime account like Free quick shipping for Amazon purchases, Free Grubhub+, Amazon Prime Video, Amazon Photos, discounted Amazon Music Unlimited, discounted Prime Video channels and more.