Ritchie Foam - Upholstery Foam Cushion 1"x 24” x 80" 36ILD (Medium Firm) High Density Seat Cushion Replacement Foam, Upholstery Sheet Foam, Foam Padding, Made In USA - Walmart.com
GOODNIGHT EVA 1/8" FOAM PAD - Mountain Laurel Designs
Tenex Multi-Purpose Foam Pad 2 Ft. x 6 Ft. in the Craft Supplies department at Lowes.com