Amazon.com: Polycarbonate Dark Gray/Grey Smoked Tinted Transparent Sheet 11.850 x 11.850 Inches 0.118 Thick : Industrial & Scientific
Coroplast Plastic cardboard 0.157-in T x 24-in W x 36-in L Black Corrugated Plastic Sheet in the Polycarbonate & Acrylic Sheets department at Lowes.com