4mm x 48" x 96" Black Coroplast® Sheet - UV Resistant | U.S. Plastic Corp.
4X8 Black Coroplast Corrugated Plastic Sheets Polypropylene Twinwall Profile Sheets - China Coroplast, Black Coroplast | Made-in-China.com
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
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Black Plasticore 4mm 48 x 96 sheet 10 pack-BPC48964mm-10
Amazon.com: (10 Pack) Black Corrugated Plastic Sheet 24" X 36" Horizontal : Industrial & Scientific