Most any store that sells glass will also sell and cut plexiglass. With the right cutter it takes only a few seconds to cut a square, just like glass. Sounds like they just didn't want to be bothered. Talk to someone at a glass replacement place. Plexi comes in different thicknesses and they'll want to know how thick you want it. Use one of your rulers to get the thickness. Formica all by itself is VERY sharp!!