3" X 20" X 20" Upholstery Foam Medium Firm Foam Soft Support (Chair Cushion Square Foam for Dinning Chairs, Wheelchair Seat Cushion Replacement) : Amazon.ca: Home
SunGlo Compact Rolled Foam 72 X 30 X 4 Inches | Walmart Canada
Polyethylene Foam Sheets 2.2LB | Foam Factory, Inc. - Canada