DEAYOU 12 Pack MDF Wood Board, Unfinished Wood Art Canvas Boards, Wooden Panels for Painting Crafts, Medium Density Fiberboard, 1 Inch Thick Wood Blocks Chipboard for Engraving, Chip Carving, 5" x 3" :
MDF Panel - 1/2" x 2' x 4' MDF1224 | RONA
1/2" MDF Sheets - 24"x46" - Woodworkers Source
How to join MDF boards edge to edge - WorkshopTherapy.com