Learning the difference between new 2006 Audi S4 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 2006 Audi S4 invoice prices to get a feel for bargaining room. Researching all of the new 2006 Audi S4 costs and prices can save you thousands of dollars when purchasing a new car. You will be able to successfully negotiate for a better 2006 Audi S4 price, and you will be able to identify a dishonest dealer or salesperson. Are you getting the best deal on your new car?