They are decent for the price, but in my opinion they are ugly.
Sennheiser HD 202 Headphones can be purchased at any of the following retailers: B & H photo, Sweetwater, Amazon, Ebay, and the official Sennheiser website,
Sennheiser HD 515 headphones don't have true noise cancellation so that they do allow in outside noise.
Sennheiser HD-202 headphones can be found online for about $30. Sometimes they can be found as low as $25 or as high as $40, but $30 is a common price.
Sennheiser HD 650 headphones can purchased for approximately 500 US dollars. These headphones are available online on Amazon, Head-Fi, eBay and bass & Headphone.
The Sennheiser HD 280 Pro headphones can be bought in a multitude of electronic online retailers. The most popular ones are Amazon, Sennheiser's own website, Newegg and Sweetwater.
The Sennheiser HD 595 headphones are available for sale in many stores such as amazon sony shop411 walmart and sweetwater. Also online stores like ebay sell those headphones as well
Headphones that sound the same as Beats but relatively cheaper are Sennheiser HD 202 II Professional or Sennheiser RS120.
Sennheiser HD 25 are noise reduction headphones. They are most often used by DJ's as it is important for them to hear the music first hand instead of muffled by people.
Sennheiser 202's Mark II, I don't own them but they have many good reviews, I own these and they are brilliant! Sennheiser HD 555
The average price one can find Sennheiser HD 555 headphones for online, from companies such as Amazon, is around 85 to 100 dollars. One can find many deals on many different sites at various times.
There are many stores that sell Sennheiser headphones including the official Sennheiser online store. In addition, one can find and purchase Sennheiser headphones in stores such as Best Buy.
Sennheiser! They give the best Beats and sounds. Skullcandy tend to distort