8 Pack Corrugated Plastic Yard Signs 24x36 for Outdoor, Open House, Birthday, Lawn, Foam Poster Board with 4mm Blank Surface (Black) | Michaels
24" x 36" Corrugated Plastic Sign and Poster Board, Set of 2 | Source One Displays
Amazon.com: MOUYAT 15 Pack 18 x 24 Inch Large White Corrugated Plastic Sheets, 5/32 Inch 4mm Thick Waterproof Corrugated Plastic Sale Sign Blank Board for Dividers, Poster Board, Yard Making Signs : Industrial & Scientific
pacon large poster board 22 x 28" sheet, white or black only – A Paper Hat