There are several ways to buy a compound fertilizer production line, including: 1.Directly from a manufacturer: You can find compound fertilizer production line manufacturers online or through trade shows and exhibitions. Directly contacting a manufacturer can often result in a better price and customized solutions for your specific needs. 2.Through a distributor or supplier: Some companies specialize in distributing or supplying compound fertilizer production line equipment. This can be a good option if you are looking for a specific brand or equipment type. 3.Online marketplaces: Online marketplaces such as Alibaba, Made-in-China, and Global Sources offer a wide range of compound fertilizer production line equipment from various manufacturers. However, it's important to research and verify the reliability and quality of the manufacturer before making a purchase. 4.Second-hand equipment: You can also consider buying second-hand compound fertilizer production line equipment. This can be a more affordable option, but it's important to inspect the equipment thoroughly and ensure it's in good working condition before making a purchase. Regardless of the option you choose, it's important to carefully research and compare different manufacturers and suppliers to ensure you're getting the best deal and quality equipment for your needs.