Focus on the Total Cost of Ownership (TCO) rather than just the unit price. Negotiate for spare parts kits (liners, valves, patches) to be included at no extra cost, which typically represent 5-8% of the product value. For large volume orders, request a progressive discount structure where the price drops by 3-5% for every additional container ordered annually. On platforms like Made-in-China.com, you can verify the supplier's Audit Reports to leverage their production capacity in your price negotiations.