I found marine ply at matthews and field lumber in rochester on stonewood ave 585-663-0430. I don't think they sell much, they had to search for it. I think they didn't raise the price since they got it in .If I remember maybe 120.00 That was two years ago. The guy that brought it out and helped me load said it was way heavier than regular plywood. Other places said they could get it but had to order it in.