If it was me, I'd probably buy the right thickness plywood sheet and cut it out to the same dimensions. I think you can reuse the edge and leg fittings off the old one. I'd sand it, smooth the edges, and finish it with a good urethane. Or you could bond formica or some other surface to the top.
Otherwise, you could take your old one to a carpenter or cabinet maker and ask them to make another one.
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