I found this serving platter on Targets website...https://www.target.com/p/acacia-serving-platter-12-15-brown-threshold-153/-/A-16825091
I am sure doing a bit of googling will give you some options. Etsy would probably be a good place to look as well.
I bought one of the Target bases a couple of years ago, but I am thinking about visiting my local sawmill and see if they will cut me a nice piece approximately 14" in diameter and 4" high. I would seal it with varnish. Since the cake always has a cake board between it and the base, there would be no need of worry about whether or not it is food safe.
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