ArtSkills® Trifold Foam Display Board - White, 22 x 28 in - Ralphs
Amazon.com : 8 PCS Trifold Poster Board- Large 40" x 28" Tri Fold Display Board Hard & Thick White Presentation Cardboard for Science Fair, School Projects, and Business Presentations Supply : Office Products
28" X 40" White Tri-Fold Corrugated Presentation Board
2-Ply Tri-Fold Project Board, 36" x 48", Black - Zerbee