You can buy cornhole boards at http://www.winchestervacornhole.com
They deal in and around Winchester. They make custom boards and sell bags too. In some cases they even deliver.
Corn Hole Games and Bags are available online at www.maurysmoldings.com or order from Maury at (540) 869-2531.
Other people asked questions on similar topics, check out the answers they received:
Other people asked questions on various topics, and are still waiting for answer. Would be great if you can take a sec and answer them