In the sintered stone bathroom vanity business, there is intense competition, with many factories resorting to purchasing discounted slabs for as low as 1.5USD/M2 to reduce material costs. These discounted slabs often have quality issues, and manufacturers offer significant discounts to clear inventory. The common practice is to mix high-quality and poor-quality slabs together, selling them at very low prices. Some defects can be avoided during cutting, but others cannot, leading to potential quality issues in the finished products. In contrast, our approach involves strategic bulk purchasing through collaborative procurement from sintered stone slab factories, securing discounts and implementing strategic material storage. We acquire a large quantity of slabs in a single purchase without compromising on quality.