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
Trifold Poster Board 36″ X 48″ White Presentation Board Science | eBay
BAZIC Tri-Fold Corrugated Presentation Board - White 28" X 40" - Bazicstore
BAZIC Tri-Fold Corrugated Presentation Board - Assorted Color 36" X 48" - Bazicstore