Learning the difference between new 1989 Mercedes-Benz 420-Series prices, invoice pricing, MSRP, and other dealer costs will help you save money when buying a new car. Compare the manufacturer suggested retail price with 1989 Mercedes-Benz 420-Series invoice prices to get a feel for bargaining room. Researching all of the new 1989 Mercedes-Benz 420-Series costs and prices can save you thousands of dollars when purchasing a new car. You will be able to successfully negotiate for a better 1989 Mercedes-Benz 420-Series price, and you will be able to identify a dishonest dealer or salesperson. Are you getting the best deal on your new car?