Amazon.com: BAZIC Trifold Presentation Board 36" X 48" Assorted Color, Tri- Fold Corrugated Poster Boards, Cardboard for Display Boards Science Fair Art Project, 24-Pack : Everything Else
Black 36" x 48" Foam Tri-Fold Display Board | Michaels
Elmer's 36"x 48" Corrugated Tri-Fold Display Board - Black
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
Artskills 36" X 48" Tri-fold Corrugate Project Display Board - White : Target