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
ArtSkills® Foam Trifold Display Board - White, 22 x 28 in - Kroger
Amazon.com: ArtSkills Tri-fold, 28" x 22" Trifold Foam Display Board, White, 28" W x 22" H, 5 Pack : Office Products
Tri-Fold White Grid Lines Foam Board 22"x28" Open, 5/case | Royal Brites
ArtSkills® Trifold Foam Display Board - White, 22 x 28 in - Ralphs
Elmer's Tri-Fold Corrugated Display Board, 28" x 40", White - Walmart.com