博茨瓦纳采购需求：白色马桶，壁挂式马桶套装，壁挂式马桶，陶瓷马桶盆，白色洗脸盆，洗手间洗脸盆

I'm interested in sourcing a cost-effective combination of a water-saving toilet and sink specifically designed for low-cost housing projects and educational institutions. This product needs to be efficient, durable, and easy to install, catering to environments where budget constraints are a primary concern. Please provide information on available options that meet these criteria, including pricing, specifications, and any bulk purchase discounts. I'm looking for solutions that enable responsible water usage while ensuring quality and functionality for schools and affordable housing. Looking forward to your prompt response!