There are a variety of places that can make spare keys for cars, including:

Dealership: The dealership where you purchased the vehicle is likely to be able to provide you with a spare key. This can be more expensive than other options, but it is often the easiest and most convenient choice.
Auto Locksmith: Professional locksmiths can often cut and program keys for a wide range of vehicles. Many locksmiths are mobile and can come to you, so this can be a convenient option if you are unable to get to a physical location.
Hardware Store: Some hardware stores have key-cutting services and can make a spare key for your car. This may be less expensive than going to a dealership or locksmith, but the key may not be programmed to start your car.
Online Key Cutting Services: There are websites that offer key-cutting services and can mail you a spare key. You will need to provide the key code or VIN number for your vehicle in order to have a key made.

It's important to note that the cost and availability of these services can vary depending on your location and the make and model of your vehicle.

Having a spare key for your car is a good idea for several reasons:

Convenience: Having a spare key ensures that you will always have a way to enter your car in case you lose or misplace your primary key.
Peace of mind: Knowing that you have a spare key can provide peace of mind in case of an emergency or if you get locked out of your car.
Reduced stress: If you find yourself in a situation where you are locked out of your car, having a spare key can help you avoid the stress and frustration that come with the situation.
Cost-effective: Losing or damaging your primary car key can be expensive, as you may need to replace the entire lock and key system. Having a spare key reduces the risk of this happening and can save you money in the long run.