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
Pacon® Spotlight Corrugated Presentation Display Boards, 48 x 36, Black/Kraft, 24/Carton | Lower Huron Company
Office Depot Brand Tri Fold Project Board 36 x 48 White - Office Depot
Corrugated Tri-Fold Display Board, 36" x 48" | Michaels
BAZIC Trifold Presentation Board 36" X 48" White, Tri-Fold Corrugated Poster Boards, Cardboard for Display Boards Science Fair Art Project, 24-Pack - Newegg.com