White Poster Boards - 22" x 28" | Hobby Lobby | 639328
Presentation Boards : Target
Poster Boards in Presentation Boards & Presentation Easels - Walmart.com
Amazon.com : Ctosree 36 Pcs White Foam Board 18 x 24 Inch Foam Poster Board Bulk 3/16 Inch Thick Foam Core Board Large Sign Board for Display School Projects Presentations Mounting Arts Crafts : Office Products