Purchase Channels of Budget Commodities for Cost Accounting

How to choose the purchase channel of goods? How can I get the most discounted products?

The discount rate of commodities changes according to the quantity on purchase order and market fluctuations. According to the principle of large quantity and preferential treatment, a discount rate of about 20% can generally be obtained. Make use of the breakage rate of capital goods, the scrap rate of expired products, and the need for frequent replacement, and other factors to discuss monthly settlement with the supplier.