Poly-Fil® Crafter's Choice® Decorative Square Pillow Inserts by Fairfield™, 16" x 16" (Pack of 2) - Walmart.com
MoonRest 16x16 Inch Synthetic Down Alternative Square Pillow Insert Form Stuffer for Sofa Shams, Decorative Throw Pillow, Cushion and Bed Pillow Stuffing - Hypoallergenic 16“X 16” : Amazon.co.uk: Home & Kitchen
Pillow Insert 16x16 Inches Pillow Form Cushion Cover Insert Pillow Filler Decorative Pillows Fiberfill Stuffing Bed Pillows Sham - Etsy UK
Swift Home Cotton Blend Pillow Insert 16-in x 16-in White Indoor Decorative Insert in the Throw Pillows department at Lowes.com
E4Emporium Cushion Inner Pads 16” x 16” (40cm x 40cm) - Hypoallergenic Pillow Inserts (Pack of 2) - Hollowfibre Square Cushion Stuffer for Sofa Couch & Bed Cushions - White : Amazon.co.uk: Home & Kitchen