There have been two generations of this car. The first, the W208, was sold from 1996 until 2002.
They were made to compete with the BMW 3-Series coupe, and these cars were considered the first midsize coupes made by Mercedes Benz.
These early CLK cars looked a lot like the E-Class. Mercedes was essentially trying to fool its customers into thinking the CLK was the replacement for the E-Class, because they did not make a direct replacement for that car. That's why the CLK, which was based off the C-Class, ended up with the 4 headlight and rectangular taillight stylind made popular by the E-Class.
The original models of these cars were the CLK230 Kompressor, CLK320, CLK430, and CLK55 AMG.
The W209 version of the CLK series has been sold since 2003. They are all sold with V6 or V8 engines. The CLK63 AMG comes with a rare 7 speed automatic transmission.
Some rarer models of this car include the CLK-GTR, which was a road racing car, and the CLK DTM AMG, a sports car with a supercharged V8 engine. Only 25 of the former were made, and many more of the latter were made and still are made on a limited basis.
To buy one of these cars or find parts for one, check your local Mercedes dealer or browse the listings on eBay. You'll be surprised what rich people are willing to take for their "old junker" 6-year-old luxury sports car.