Amazon.com: Foamma 2" x 24" x 24" High Density Upholstery Foam Padding, Thick-Custom Pillow, Chair, and Couch Cushion Replacement Foam, Craft Foam Upholstery Supplies, Foam Pad for Cushions and Seat Repair :
Amazon.com: Upholstery Foam 6" Thick, 30" Wide x 72" Long Medium Density : Arts, Crafts & Sewing