3M SandBlaster Pro 320-Grit Commercial Sanding Sponge 2.5-in x 4.5-in in the Sanding Sponges department at Lowes.com
Arology 3 PCS Sanding Sponge Block Pad, Mix Grit includes 1 Fine, 1 Medium, 1 Coarse, Great for Kitchen, Drywall, Metal, Wood, Painted surface and Fiberglass, Use of Hand Sanding and Finishing - - Amazon.com
Sanding Sponge – oldfashionedmilkpaint.co.uk
Finish 1st 5 1/4in Finishing Block Sander Kit
Warner Sanding Block Hand Sander, PK10 34436 | Zoro