Injection molding is a cost-effective manufacturing process that can produce high-quality parts in large volumes. However, there are still ways to reduce the cost of injection molding without compromising quality. To reduce the cost of injection molding, you should optimize your part design by simplifying it, minimizing wall thickness and features, avoiding undercuts and complex geometries, and using uniform wall thicknesses and draft angles. You should also choose an appropriate material that suits your product requirements and has a low price per unit weight. You can also use recycled or regrind materials if they do not affect the quality or performance of your product.