Don't know about used cars but they sure do with new ones.

Just special ordered a new 07. Spoke with several dealers. Ranged from MSRP all the was to 7% discount off MSRP. I believe that they will all deal.

Even if you don't buy it from your local dealer, the dealer will be happy to bill Porsche for the warranty labor.

I bought local with about a 5% discount.

FYI, I have bought almost all of my cars through Sam's Club Auto Network. They only have a few Porsche dealers but one is in NJ. These guys gave me the best offer. $5,000 off on a car for a $35 annual membership fee is quite a return.