While there’s no replacement for factory-fitted extras and accessories such as airbags and much of the car’s onboard tech, you can shop around for alternatives to dealer-fitted extras. Alloy wheels, tow bars, and spoilers are often cheaper when bought from independent stores and sellers. If you know the going rates for certain accessories, this will help you decide if the dealer option is worth it.
However, remember what we said earlier about aftermarket parts and your warranty. If using a part from a third party manufacturer affects your warranty, then stick with the dealer-fitted option.