Amazon.com : Trifold Poster Board 36" x 48" White Presentation Board Science Fair Display Boards - for School, Fun Projects and Business Presentations - by Emraw : Office Products
Amazon.com : Eco Brites Two Cool Tri-Fold Poster Board, 24 X 36, White/White : Office Products
Pacon® Spotlight Corrugated Presentation Display Boards, 48 x 36, Black/Kraft, 24/Carton | Lower Huron Company