Amazon.com : Staples 247403 Poster Boards 10-Pack White 22-Inch X 28-Inch (Mmk04500s) : Office Products
Staples® Tri-Fold Foam Presentation Board, 4'x3', Black (902091) | Quill.com
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