<ul>
<li>Best rate for sending small and large packages containing books, film, manuscripts, sound recordings, video tapes, and computer media (such as CDs, DVDs, and diskettes). Rates start at $0.80.</li> 
<li>Media Mail cannot contain advertising. </li>
<li>Packages can weigh up to 70 lbs. and measure up to 108 inches in combined length and distance around the thickest part.</li> 
<li>Presorted rates are available for bulk quantities (at least 300 pieces).</li>
</ul>
<a href="http://www.usps.com/send/waystosendmail/senditwithintheus/mediamail.htm" target="_blank">More Information About Media Mail</a>