Amazon.com: Foamma 6" x 22" 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: Nigoone Upholstery Foam Cushion 5"X 24"X 24" Square Foam Replacement Foam for Couch Chair Seat Padding, High Density Thick-Custom Pillow and Craft Foam Upholstery Supplies, 5 Inch Thick : Everything Else