It depends on what type of Gullwing one has in mind. If one intends to buy an antique Gullwing, an antiques car dealer might be one's best bet. Turning to any Mercedes-Benz car dealer may otherwise be the best place to start.
I think its a Mercedes 300sl gullwing
$11,000 in 1954. $400,000 today. http://en.wikipedia.org/wiki/Mercedes-Benz_300SL
The most recognized- is the 1955 Mercedes-Benz 300sl "Gullwing"
The 1954 Mercedes Benz 300SL Gullwing is considered by many as the worlds first supercar.
One million
One can purchase Mercedes accessories from the Mercedes Benz website. The Mercedes Benz website has a large variety of parts that can be used to fix their different cars.
One can purchase Mercedes cars from a Mercedes dealership or the Mercedes UK wesbite. Alternatively, one can buy used Mercedes cars from either a local car dealership, or from used car websites such as Autotrader.
One can purchase a Mercedes W124 from a Mercedes dealer. One can also purchase a used Mercedes W124 from the website eBay UK or find one through an Auto Trader UK website.
There are many places where one would be able to purchase a Mercedes Kompressor. One would be able to purchase this automobile from sites such as Motor Trend.
The Mercedes SL65 is a roadster vehicle which is manufactured by Mercedes. One can purchase a Mercedes SL65 AMG at their local Mercedes dealer. Auto Trader has some available for private sales as well.
There are many places one might go to purchase a Mercedes ML320. In addition to an official Mercedes dealership, one might also try the eBay Motors website.
You should have an authorized Mercedes dealership near your area. Depending on your price budget you can purchase a brand new Mercedes automobile, or you can purchase a previously owned Mercedes for slightly less.