Aug 18, 2021 · Surface grading for a gravel road costs per square foot. Return to top. Cheapest gravel for driveways. The cheapest gravel for driveways is crusher run, crushed shells, crushed concrete, slate chips, recycled asphalt, and pea gravel, which all cost 15 to 30 per yard, or less than 1 per square foot when purchased in bulk from a quarry.