You should go to Audi's website. They will have the most up to date information on dealerships and their locations. You should be able to find one in your area.
www.thule.com would be a good place to start! You can purchase directly on the website, or use their dealer locator to find a store near you where you can browse.
A good place to start looking for a PlasmaCar is at the official website. The website offers a store locator so one can find a location near them that offers these products.
There are many places from which a Chevrolet 2500HD can be purchased. The best place to start looking would be at a local Chevrolet dealer or by visiting Chevrolet's website to find a local dealer.
A really good place to start looking for a Volvo V70 is AutoTrader. You can choose how far away you would be willing to go, price, dealer or private sellers and lots more options. It will show you everything that has been listed with them. And of course your local Volvo dealer is also a good place to talk to and let them know what you are looking for.
This would depend on where you live but a good place to start would be your local Volvo dealer or online at http://www.volvocars.com they have plenty of information that should be able to help you find what you are looking for.
Your local Subaru dealer is the best place to start for a new Subaru Baja. If you are looking for a used vehicle, try CarMax locations for the best deal for this automobile.
Your local Dodge dealer would be a good place to start...
A coin show or dealer is a good place to start.
The Mercedes website is a great place to start (www.mbusa.com). This site offers detailed make/model comparisions and includes a locator for dealers in your area.
Used car sale sites are all over the internet. It doesn't matter where you start. You can start with a dealer or start with the model of car you are looking for.
The best place to start looking for a used Fiat Panda would be Auto Trader. They have both a magazine, as well as online services to start your search. Another option might be to visit a Fiat dealer and inquire if they have any for sale.
Depending on the year one is looking for, either a local GMC dealer, or the local newspaper should provide one with at least some information. If one is looking for a used GMC, the local newspaper is still a good place to start.