In my experience most glass stores also carry acrylic. I have purchased it there several times for various projects. They also cut and bent acrylic to my specs for a price.
You really don't need a CNC machine to make a round platter. A lathe or bandsaw will do the job quite nicely. I prefer the bandsaw. Just cut the spindle hole on a drill press then use it as a pivot point to rotate the acrylic through the bandsaw blade (use a narrow blade like 1/4 or less) and finish per the Teres instructions.
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