Amazon is offering a free 1-month trial membership of Amazon Prime, plus you will get a $10.00 credit on your next order. (Amazon Prime gives you free 2-day shipping.) I normally don't do trial offers because I'm afraid I'll forget to cancel them, but this is easier than easy! After you sign up for your free trial, log into your account, and click the button that says "do not upgrade automatically". Your free trial will automatically cancel after a month. There are plenty of things you can order for $10.00 and under that you can get for free! Just put what you want in your cart, and when you get to the checkout, your $10.00 credit should show up there. Go here to sign up.
(Hurry, though; this offer is only good until July 28th. Also, this offer is only for new Prime subscribers.)