Have you contacted Jayco? They may have a replacement available.
Any fabricator of laminated counters could make one.
But, you can make one yourself...not that difficult but use a good router bit designed for trimming the edge, which can be a little tricky.
Or, make one of high grade plywood and use stain and urethane finish. Satin wipe on urethane is easy to use and is less prone to attracting dust. But, it takes more coats to really build up the surface.