When evaluating bathroom vanity prices, the material is the primary cost driver. For high-moisture environments, Solid Wood (Oak or Walnut) offers the best longevity but comes at a premium price. Plywood with a waterproof veneer is the most cost-effective professional choice, providing excellent stability against warping. Avoid low-grade MDF in high-humidity areas unless it is specifically rated as MR (Moisture Resistant). Ensure the countertop is made of Sintered Stone or Quartz, as these are non-porous, scratch-resistant, and easier to maintain than natural marble.