Amazon.com: PET Plexiglass Sheet/Panel 24" x 36" x 0.04" - Pinziren 3 Pack Large Acrylic Glass Alternative, Plexi Protector Cover for Door, Craft Projects, Pet Barriers, Railing Guards, Clear 24x36 x 1mm :
Amazon.com: PETG Clear Plastic Sheet 24" X 48" X 0.020" : Industrial & Scientific