$66.99 Owens Corning FOAMULAR 150 1-1/2 in. x 4 ft. x 8 ft. R-7.5 Scored Squared Edge Rigid Foam Board Insulation Sheathing 88WD - The Home Depot
Plain EVA Foam Sheet, 11-1/2-Inch x 8-1/2-Inch, 4-Piece, Primary Assorted - Walmart.com
Foam Core Board - 48 x 96, White, 1/2 thick S-13722 - Uline
