Welcome to the forum. It's rare that the local dealers will be cheaper for parts. I have seen that happen. Ordering the parts at the dealership's website, if available, is cheaper with coupons sometimes/in-store pickup.
You'll save the most money sourcing the parts from reputable online dealers like Pelican Parts and wrenching on the Porsche yourself. Do the research on the forums and see what others have used as a direct replacement over Porsche brand parts. You'll learn who Porsche own suppliers are. Some parts you should stick with Porsche despite the premium cost. I would suggest before ordering all these parts to inspect the car first. You can order the common maintenance items first like oil filter, engine oil, fuel filter, and air filters. If you have the spare time drop the engine sump during the oil change, clean the throttle body and MAF sensor. Those projects will keep you busy for a few days while you wait for the parts you will need after the inspection.
