You can get headphones from Argos, HMV, The Apple Store, Music Stores, House of Fraser, Debenhams, etc etc
at amazon or a cosplay store
the store
The best way to learn about Dre headphones and their reviews would be to visit an electronics store near you. You can also visit their on-line catalogs as well.
Most likely gamestop
£26.00
One can find Sony Fontopia Headphones on Amazon but the better option would be to purchase them from the Sony store itself. Those are the main sources that can be found online.
"Bose is a high end, luxury line of electronics. The Quietcomfort headphones can be found for betwen $200 and $400 depending on the model and the store."
You can get them at many places, even at a store like Walgreens. Large music stores have huge selections and some of the highest quality headphones like Skullcandy headphones.
You can purchase these Bose headphones from the Bose website, however you can get them cheaper if you buy them through another site, for example Amazon sell Bose headphones for a fairly cheap site.
Shure Headphones can be purchased on line or in a store. Shure headphones online can be found on eBay, Musicians Buy, and Planet DJ. They can be purchased in store at Adorma Camera, Sam Ash, Parts Express, and Guitar Center.
If you are looking to purchase a pair of wireless headphones I would suggest looking into any electronic retail store such as best buy, target or newegg. Amazon carries them as well.
Noise cancelling headphones can be purchased online at Amazon. They can range in price from $10 to well over $100. Another option would be a local sporting goods store.