I think he's asking about getting setup as a wholesaler or shop by the dealer. I know someone, a multiple car collector who did manage to get set up as a wholesaler by the dealer. He did quite a bit of business, developed the relationships, ask for it, and they gave it to him. I think policy varies from one dealer to the next. I would think most dealers are going to require a tax ID number although it doesn't necessarily have to be an automotive business. A lot of dealers give an MB club discount, most commonly 10 percent, of course some of them are jacking up the pre-discount price above the MB suggested retail price. Caliber is a good place to buy dealer items. For non-dealer items you're generally better off elsewhere.