Newbie want to talk. Still want to expand knowledge about these classy vehicles.

I'm into a small time car parts business that needs cheap parts but really have the good quality as compared to the parts that can be bought to expensive car shops. As of now, I'm into the luxury vehicles, I need some BMW accessories and Mercedes 300e parts on stock. I'm trying to expand the store, we only have some for sedans and coupes now. Hope some ideas will be shared. Thanks.