High Density Foam Board | HDU Sheets | Laird Plastics
4lb Corafoam / Dunaboard U40 Small Sheets Blocks - The Compleat Sculptor
Sign-Mart | HDU Sign Board
Amazon.com: HDU Sheet High Density Urethane Foam for Machining, Carving, Signmaking 15 lbs/ft3 Density 1" Thickness Many Size Options : Handmade Products