Its expensive for a reason, the parts are genuine and the mechanics are experienced. If you happen to be a hands on type of owner, you may want to install the part yourself; however, if you are not, there is no one better to install a replacement part than the dealer. The next place that people turn to when looking for parts is the internet. The internet has so much information floating around that it can be difficult to pinpoint the information you are searching for. The best place to start your search for parts online is to look for Mercedes Benz specific sites these sites often contain forums. Forums are generally populated with like-minded people, each with varying degrees of expertise with Mercedes Benz.
One thing that most of these people will have in common is the willingness to help you locate what you are looking for; they may even be able to provide instructions on how to install the part, if you are the hands on type. Mercedes Benz specific sites also offer other advantages. Most sites will have at least one photo of the item you are looking for as well as reviews from past purchasers.
