BuyPlastic King ColorCore Plastic Sheet 1/4" x 12" x 48" Black- Arctic White-Black Color Core , HDPE Board, High Density Polyethylene Panel - Walmart.com
Coroplast Plastic cardboard 0.157-in T x 24-in W x 36-in L White Corrugated Plastic Sheet in the Polycarbonate & Acrylic Sheets department at Lowes.com