Wanted: Plywood/board/wood around 84x119cm or A0 size drawing board

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I'm an unemployed local artist trying to make it my career, Currently having to use two smaller pieces of plywood I found in the street to cobble together a larger board for my paintings, which is far from ideal. So if anyone has an off-cut board or plywood around A0 (84 x 119cm / 33 x 47inches, pref slightly larger) that would be great. 3-6mm ply would be best, marine ply even better but must have at least one smooth side, but anything (thin wood, board etc) as long as it's not too heavy, flat, got a smooth surface and is fairly waterproof or can be made so. Or very unlikely if someone has an A0 drawing board to spare (just the board) that is possible to carry home - they can be heavy! I can varnish and sand it if needed but can only do that by hand so anything really rough would take me many weeks and a lot of sandpaper!

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