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www.ebay.com
One can find a used Porsche for sale at your local Porsche dealership, Auto Trader, Kijiji, Motor Trend, Car Gurus, and Automobile Mag to name just a few.
You can find a directory at: http://www.automotive.com/used-cars/11/porsche/boxster/index.html
the place that you can find information on a porsche boxter is ebay.com or porsche.com
There are lots and lots of things available that you can buy and find at ebay including used Porsche Boxsters, or any other kind of porsche sports cars.
a cayenne turbo is 450 standard but can be modified to 600+ ACTUALLY, you can find used Porsche cayennes for as low as 17,000!
A reliable source to a buy a used Porsche would be Copart, it has the best deals available for all types of cars, especially for Porsche, and from many countries. This is a place were you bid for a porsche that would normally cost about 25,000, and you could get it for about 15,000.
A Porsche Cayenne Turbo is a fairly rare item, but can be found listed on AutoTrader, Edmunds and the classifieds section of MotorTrends. A local Porsche dealer would also be a likely place to find a used Cayenne Turbo for sale.
Used Porsche cars can be found for sale in newspapers, the internet and even Craig's List. Imported car dealers may have the largest selection of used Porche cars for sale.
There are many different porsches so you will have to be more specific, however the current line includes cars starting at $58 000 (Porsche Boxster) to $297 000 (Porsche GT2 RS). However the most expensive Porsche that you could find would be on the used markets, it is the Porsche Carrera GT which you could find for around $500 000.
yes
all porsches sold from an official dealer are Porsche approved by the technicians for the sales department. you can ask to see the used car check sheet and the 111 point check sheet before you buy the car.