Re: Who sells marine plywood?
Hardwood suppliers near marine locations. In Seattle you can get it at Crosscut Hardwoods. I don't know what the locations would be in the Philadelphia and upper Chesapeake region, but I bet that a good local boat yard could point you towards it.
boats that I sail on regularly: Pearson 28-2, Rondar 505, Yankee 30, Blanchard Junior