MILMED21-247-2 Corps of Engineers 3 1/2". Quantity of 1-9 $28.03, 10-14 $26.81, 15-24 $26.06 for 25 or more, please contact us. If you place your order on line it will calculate your purchase at the 1-5 quantity price. Your purchase will then be re-calculated based on the quantity you ordered.