多米尼加采购需求：镀锌钢卷、彩涂钢卷、彩涂钢卷、H型钢、钢筋、角钢

I'm interested in purchasing a large quantity of your products and would like to know more about the options available. Specifically, it would be helpful to understand any minimum order requirements, pricing tiers, and lead times for bulk orders. Additionally, I'd appreciate if you could provide details on your payment terms, shipping options, and return policies. Having this info will help me make a well-informed decision. Looking forward to your response!