* Type of engine: A small lawnmower engine costs far less than a car engine, which costs far less than a jet engine or a large ship's engine.
* Size and power: Larger, more powerful engines are significantly more expensive.
* New or used: Used engines are considerably cheaper but come with higher risk.
* Brand and make: Some manufacturers command premium prices.
* Features and technology: Advanced features like turbocharging or fuel injection add to the cost.
* Where you buy it: Prices can differ between retailers and online marketplaces.
Therefore, it's impossible to give a single answer. To get a price, you need to specify the type, size, and condition of the engine you're interested in. For example, a used small car engine might cost a few hundred dollars, while a new high-performance engine for a sports car could cost tens of thousands. A large industrial engine could cost hundreds of thousands or even millions of dollars.