We bought two small sheets of black acrylic. We used a long straight-edge and a utility knife to score the sheets. I improvised a break using the edge of a table and a 2x4. The sheets snap easily. (Ironically I have a small mini-break I made in my shop, but at the time, we were 100 miles away from shop).
I used 1/4", but you can buy 1/8" cheaper and pad the back with a sheet of cardboard.
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