Tri-fold Poster Board Template by Mrs Quengas TpT Store | TPT
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
Elmer's 36" X 48" Tri-fold Foam Presentation Board - White : Target
Office Depot Brand 2 Ply Tri Fold Project Board 36 x 48 Yellow - Office Depot