Stephen, I have mine here at the house for winter storage. If needed I can measure it and draw it out for you with dimensions. You could then draw it on card board (template, make sure it fits) then purchase a slightly larger cutting board, trace it and cut it it to size. Afterwards sand it and use a food grade mineral oil to seal it up. This may be too much work for ya, but it's a thought....especially if you can't find one. Let me know.
Joe