A car stereo system installation is dependent on what you included, but on average, the actual installation is often free if you purchase the stereo system from a dealer who will do the installation. If you purchased the system elsewhere, you are looking at an installation of around $40. There are also places that will install them for a dollar. If you are going to be buying a new system rather than replacing an old one, you should head over to somewhere that installs it free, such as Best Buy. When you get the installation quote, make sure it includes everything. You don’t want additional costs added onto your car stereo system installation for necessary parts after the fact.
For more info, see Best CD Car Radios