Re: Who sells marine plywood?
It is often available via special order from any good local lumber yard. There are internet sources as well. One near (M.L. Condon Company) me has the following list of marine lumber:
Ash White Quartered
Birch, Sound Lauan Black
Mahogany, Philippine Ribbon Stripe
Mahogany, Philippine Rotary
Mahogany, Honduras Flat Cut A1
Mahogany, Bruynzeel Regina
Mahogany, Occume (MFC)
Teak, Quartered, G1S (Mahogany back)
Teak, Quartered G2S Both faces
Teak, Black Line Plydeck Decking Boards
I don't think any of the chains will be able to get much for you. They specialize in bulk purchases, and tend to be just as or more expensive as the smaller local guys on small orders. Bruynzeel and Occume seem to be the most common quality marine plywood for boat building. I would not recommend pressure treated, as it tends to not have a very fine surface, and will be unlikely have the correct glues.