The MSRP for the base model Cayenne is $49,600, and the higher models can go as high as $146,000. Many consumers will find that the 2014 Porsche Cayenne is a dream family car. How to Calculate The Dealer Cost of a Porsche Cayenne : Formula for Calculating Dealer Cost: 1  Example: Base Porsche Cayenne invoice price + the dealer Invoice price of options + destination-Holdback = Total Dealer Cost.