M_Boats: Marine Plywood in Minnesota

Can any of you folks in Minnesota recommend a supplier of marine plywood? I need to make new hatch boards for my M-17, and I'm having trouble finding suitable material. Based on the research I've done so far, plus my one shot at this several years ago, I think I want 9mm Aqua-tek Meranti. I've found one supplier in St. Bonifacious, but I have to buy a 4 x 8 sheet, which is double what I need. I haven't yet found anybody who can use the other half. Rich Makela M-17 #233 - Harmony Lake Calhoun, Mpls