南非采购需求：钢结构建筑，营地房屋，预制房屋，20英尺集装箱房屋，预制集装箱房屋，预制钢结构

We're currently in search of storage units for an upcoming project in South Africa. The units will be integrated into a steel structure, and we're looking to procure around 500 units. It's essential that these units come equipped with roller doors for easy access and convenience. Could you provide us with your product specifications, pricing, and lead times? Additionally, we'd appreciate insights on customization options and any bulk purchase discounts you might offer. This project is a priority for us, so prompt feedback would be greatly appreciated. Looking forward to hearing from you soon!