More than you.
516
171 pieces per pallet
Tt depends on the amount of sod on the pallet. If it holds 50 yards, then 450 sf; if it 63 yards, then 567 sf.
Drywall is too heavy and large to put on pallets unless you're using smaller length drywall sheets less than 5 feet, which is unheard of unless they're scraps of construction trash or leftover wall...