Two Cool Tri-fold Poster Board, 36 X 48, Black-white, 6-carton — Sapphire Purchasing
Amazon.com : Ctosree 48 Pcs White Foam Board 24 x 36 Inch Foam Core Boards Foam Poster Board Bulk 3/16 Inch Thick Foam Core Baking Board Mat Foam Sheets for Craft Art
Artskills 36" X 48" Tri-fold Corrugate Project Display Board - White : Target