To maximize ROI, buyers should prioritize multi-piece sets (typically 8-42 pieces) which offer a significantly lower price-per-unit compared to individual tools. Look for suppliers on Made-in-China.com that offer OEM/ODM services, allowing you to customize the tool selection to match specific market needs (e.g., a 'Starter Throwing Kit' vs. a 'Professional Sculpting Set'). For bulk orders exceeding 1,000 units, aim for volume discounts of 20-35%, and consider FOB (Free On Board) terms to maintain better control over international logistics costs.