Dow R-10, 2-in x 4-ft x 8-ft Faced Polystyrene Board Insulation in the Board Insulation department at Lowes.com
Amazon.com: Hard Foam Blocks (4 Pack) | 8 x 4 x 4 Inch Non-Squishy Craft Foam Cubes | Polystyrene Brick for Arts and Crafts, Sculptures, Floral Arrangements, Modeling, Centerpieces & More by
1-in x 4-ft x 8-ft Expanded Polystyrene Board Insulation in the Board Insulation department at Lowes.com
DuPont™ Scoreboard Foam Insulation, 4 x 8 ft, 1 in, R 5.0, Full Truckload - AWarehouseFull
Owens Corning® FOAMULAR® R-15 Polystyrene Foam Board Insulation 3" x 4' x 8' at Menards®
50mm Polystyrene Insulation Board EPS70 8X4 Single Sheet