A handy place to get raw material for projects like this is the local cabinet maker. They have scraps of all sorts of materials that are used for kitchen counters, and most will give you "sink holes" for free if you ask nicely.
My local guy sells these to a bar stool maker and odds are that folks all over the country are sitting on one. He told me he gets a dollar apiece but gives them out for free to friends, like folks who drop in with a cup of coffee. Hint taken, and I now have an unlimited (within reason) supply.
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