The price is primarily driven by raw material resin costs (linked to global oil prices), order volume (MOQ), and customization. Standard white or natural bottles are the most cost-effective. Adding UV inhibitors, custom colors (Masterbatch), or silk-screen printing will increase the unit price by 15-25%. To optimize costs, look for suppliers on Made-in-China.com that utilize multi-cavity injection blow molding (IBM), which offers better precision and lower per-unit costs for high-volume orders exceeding 50,000 units.