Welcome to the forums! I assume you're talking about a clear outer part, with inner colors, right? (An entirely clear setup is something I've never seen.) Try eBay, they're usually a few hundred bucks.
BenzWorld.org forum is one of the largest Mercedes-Benz owner websites offering the most comprehensive collection of Mercedes-Benz information anywhere in the world. The site includes MB Forums, News, Galleries, Publications, Classifieds, Events and much more!