MDF (Medium-density fibreboard)
Think of it like sawdust and wood glue mixed together.
Strength: Medium – This can take a beating but can dent easily, especially on edges or corners.
Sanding: Easy – Very easy to sand and shape
Price: Cheap – $6 for a 2 foot by 4 foot sheet of 1/4 inch thickness
Where: Home Depot or Lowes