Tri-fold Poster Board Template by Mrs Quengas TpT Store | TPT
Amazon.com : AKOLAFE 30 Pack 10x8 Inch Foam Boards, 5 mm Thick Foam Core Board 1/5 Inch White Foam Sheet, White Polystyrene Poster Board Signboard for Presentations, School, Office & Art Projects : Office Products
10pk 28" X 22" Poster Board White - Up & Up™ : Target
3pk Primary 28'' X 22'' Heavy Weight Poster Board Red/green/blue - Up & Up™ : Target