Delivery Frequency Evaluate the number of deliveries needed each week by all vendors. We often see an unnecessary number of deliveries from the same vendor, which can cause increased product costs. After all, it costs the vendor considerable dollars to load, stop and deliver product. Additionally, your cost of labor and accounting increases due to additional inventories taken, orders placed, deliveries checked in and products stored, invoices posted and paid, and checks written. It can cost up to $ 70.00 per invoice, simply to pay for the ‘accounts payable’ function of your business.