http://www.dullesglassandmirror.com/lexan-polycarbonate-glass.asp You can custom build your exact size a 1/4 inch 3' x 4' will be around $175 shipped
or just put a thick acrylic glass(which probably will cost you same as above) find a good commercial plastics wholesaler in your area(should be at least 30% cheaper than home depot or lowes)
Get a grounded mat, attach it to the buildings' earth ground. Work with bare feet on it and soak up electrons all day, be a lot healthier... read the research: http://www.amazon.com/Earthing-Impo...=UTF8&qid=1364340225&sr=1-1&keywords=earthing
Some nice indoor outdoor carpet attached to strong flat backing board. Shaq would need 1" cardecking, PeeWee 3/8". Round the edge and staple for that Martha Stewart look.