You might get something off an ex-demo or cancelled order Cayman (depending on the model), and summer is the best time of year to buy a fixed head coupe rather than a Boxster, but Porsche dealers are very good at enforcing list prices.

Have the car serviced with an oil and filter change at least once a year or once every 10,000 miles whichever comes first. Do not enter a service contract that provides for inferior servicing.