Amazon Student and get Amazon Prime Benefits (Including Free two-day shipping, Free release date delivery on videos, games etc) for FREE for six months. I'm pretty sure you can just sign up again in 6 months if you're still a student. It's totally worth it!
If you're not a student, but you're a caregiver or happen to buy lots of things for children you can still get Amazon Mom which gives you a lot of the same perks. Your Prime membership just gets extended 1 month for every $25 you spend on baby/kid items (up to one year. I'm not sure how you renew afterward.).