If you are a student, with a valid .edu email address, then you can get Amazon Prime absolutely free for one year. With Amazon Prime, you get unlimited free two-day shipping on any order, no $25 order minimum, and you can upgrade to one-day shipping for $3.99 per item. All you need to do is provide an .edu email address, the state you attend school in, academic level, and your major. They may or may not ask you to furnish proof of enrollment and alumni addresses are, in general, not accepted. If you are accepted and they ask for proof and you are unable to provide it, they may ask you to reimburse them for shipping (here are some other terms & conditions).
The membership is free for the first year and then is renewed at $79 a year.