Cheapest I found about 5 months ago was Morristown BMW. Everyone else wanted more. Don't go aftermarket. They're not difficult to install, but they're not easy either. It took me about 1/2 a day, and I'm pretty good with a wrench. Figuring out all of the little plastic clips for the trim, and making sure everything got perfectly aligned took awhile. I see no real advantage to getting in or out. But they do help when washing the car.