CORK UNDERLAYMENT FOR NEW WOOD FLOORing

Just got a recommendation from Bruce Wood Flooring that I should use a cork underlayment to attenuate the noise to the folks below in our new condominion.
Any suggestions where I could buy the stuff in the Norfolk, VA area? Home Depot was a "no joy".
Help would be appreciated.
PJ
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cork
condominion.
dags. the first one up is http://www.ecobydesign.com/shop/cork/cork_underlayment.html
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