Take a look at
http://www.phxcars.com/ . My buddy in Los Angeles bought his 96 993 Cabriolet from there, flawless transaction, no sales tax, for $42k, shipped to your door, included in the price. Since they are in Arizona, there will be no sales tax to you. They apparently have much more inventory than their list shows, and all their cars are only very, very clean ones. They usually are wholesalers, selling their inventory to other dealers around the country. Good luck.