Hi John-
Check DBS in Dartmouth, they have decent pricing. JT's on Aquidneck Island has a few sheets left of 3/8" I believe, but marine grade plywood is pretty expensive. The only difference is the layers, not the type of wood used. I redo decks quite a bit for my customers, and just use quality building type plywood. You will have to coat both sides with a layer of sealant, but the extra work saves lots of money off the marine grade stuff. I say don't waste yer money on the marine grade plywood, its twice the price. Can't use pressure treated either, trust me on that one........
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