I was wondering if there were any places that you could purchase sheets of clear plastic board with about .5-1mm thickness, and if you can, how can it be cut down? I need a piece that is approximately 60x60 cm, would they even sell sheets large enough to cover this size? Any help or insight would be greatly appreciated.
The hardware store has stuff like that, they also offer cutting services.
Lowes and Home Depot have them but they are expensive. They come in all different sizes but they wil cut them to fit if needed. It is called plexiglass.
Sounds like you are looking for plexiglass. They have it at the big hardware stores. There is a special tool kind of like a box cutter that you can use to cut it yourself, or they will cut. You could certainly get one 60x60cm.