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
Eco Brites Two Cool Tri-Fold Poster Board, 24 x 36, White/White | OfficeSupply.com
Amazon.com : Eco Brites Two Cool Tri-Fold Poster Board, 24 X 36, White/White : Office Products
Elmer's 36" X 48" Tri-fold Foam Presentation Board - White : Target