Here’s a list or some customer benefit programs that regularly offer car-buying incentives. In other words, it might be worth being a member or signing up to get a deal depending on the offers available. Some (like Costco) require membership in advance, meaning you can’t sign up when the deals are released.
Costco membership: Volvo, Audi, Mercedes, Honda (Cash card only), Chevy, anything else?
PenFed: Mercedes Benz, BMW, FCA, Mini, Volvo. Need to be member for one month, can become member through volunteer work or donation.
Volvo Club of America: note requires one year of membership to then be eligible for A plan.
BMW CCA: note requires membership for one continuous year to qualify, or six months with a three year membership.