The US Postal Service has a really neat program called Sample Showcase! If you qualify (it appears to be based on demographics) they will send you a box filled with samples! The next Sample Showcase is set to be released in just 5 days. This is offered on a first-come, first-served basis, so I would suggest heading on OVER HERE now to register!
After you sign up, you will receive a confirmation email in which you must click on the link provided and verify your information.
(thanks, The Frugal Find!)