Any of that lexan acrylic polycarbanite can be found at either lowes or home depot, I have looked, trying to find really thin sheets at the time was looking at using that as a table top cover to make the surface slick over tapeing or glueing something down like formica but could not find anything thin like I wanted.
One of those is kinda pricey to me for plastic, one is really hard, other kinda flexes but scratches easy think thats lexan.