I need plywood larger than 4x8 can it be found?

Yes you can special order plywood that is bigger. but you better plan on paying dearly for it. I recently ordered a single sheet of 4' x 10 oak veneer plywood and it cost me $160.00 where a 4'x8' sheet cost about $50.00 I think you would have better success ordering it from a lumber yard where professionals go rather than a big box home improvement store.