Calling all college students! Now through April 16th, Amazon is offering you $15 off a $40 purchase when you sign up for a FREE 6-Month Trial of Prime Student and use promo code PRIMESTUDENT at checkout! To qualify for Prime student, you must have a .edu e-mail address. Note that after your 6-month trial, you’ll get Prime for only $49 a year, but you can cancel at any time (even before the 6-month trial ends).