Purchasing processes approximately 7,000 requisitions each year. Small orders are extremely costly to the district and to vendors. Small, repetitive orders should be increased in quantity and decreased in frequency. In most cases, a year’s estimate can be made from previous orders. Vendors, understandably, resist the burden of delivering and invoicing orders when their costs become far greater than their gross mark-up for the materials sold. Ordering in large quantities also reduces costs to the district caused by the negotiation and placing of orders, paper work processing, and the issuance of warrants.