Two possible reasons are this would be that you either requested a different quantity or a different delivery. Allowing for nominal increases for the rising prices of material and labor, the price you are quoted should be consistent with previous quotes or orders as long as the quantities and deliveries remain the same. Circuit boards are custom manufactured and the price is very dependent on the quantity being manufactured and the time allowed. Since we have to perform as many steps in the manufacturing process for 1 board as we do for 1000 boards, efficiency dictates that the more product that we can run through the numerous processes required, the more time we save per board. That time saved results in better pricing for larger quantities.