Your final invoice will reflect the total quantity shipped. This means if you order 100 prints, your initial order approval will show 100 pieces, but your final invoice after production will could show an invoice quantity between 97 and 103 pieces. This is the under/over run allowance for that order. Because we bill on actual quantity, we only require a 50% payment (based on your order approval amount) to begin your order. The balance, based on the quantity to ship, is then due to ship your order. The price/piece will not change from the order approval to the invoice.