瓦努阿图采购需求：预制房屋，模块化房屋，预制房屋，模块化建筑，预制建筑，钢结构

I'm looking for information on affordable and easy-to-assemble prefabricated houses. Ideally, I need a solution that can be set up quickly and efficiently, minimizing labor and construction time. Please provide details on the various designs and specifications available in your product range. Additionally, I'm interested in understanding the materials used and any customization options you offer. It's important for me to ensure the quality and durability while keeping costs down. If you have any recommendations or insights on potential bulk purchase discounts, that would be appreciated as well. Looking forward to your prompt response!