The price is heavily dictated by condition. Brand new aftermarket replacements offer the highest reliability but at a premium. Reconditioned (Refurbished) engines are a middle-ground, but you must ask for a detailed report on replaced parts (e.g., new pistons, rings, or bearings). For used (JDM/Original) engines, the price should reflect the mileage (ideally under 80,000km) and the results of a leak-down test. On Made-in-China.com, you can find specialized suppliers for both complete assemblies and long blocks.