Can Trading Cards be shipped via USPS Media Mail?

I understand that items shipped via Media Mail by the U.S. Postal Service cannot have any advertising in them. I have a large number of Baseball, Football and Hockey cards from the late sixties, seventies and nineties that I would like to sell on eBay and would like to ship them by Media Mail due to its lower... show more I understand that items shipped via Media Mail by the U.S. Postal Service cannot have any advertising in them.

I have a large number of Baseball, Football and Hockey cards from the late sixties, seventies and nineties that I would like to sell on eBay and would like to ship them by Media Mail due to its lower cost.

Any thoughts, friends?
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