There are many websites on the internet but the best two that I recommend you to go for are HeadsetZone & Telegiants. These both websites are supplying all kinds of headsets and Headphones at the most reasonable prices compared to other websites on the internet.
According to you question you are looking for a Bluetooth headphone, I recommend you Plantronics Backbeat Pro 2.
The Plantronics Backbeat Pro 2 is a Bluetooth/Wireless noise canceling headphone. With the noise canceling feature the user can enjoy the music, calls without any interruption of extra noise playing in the background. By using the headphone, you can enjoy your rich bass, crisp highs, and natural mid-tones with the Plantronics signature audio. Backbeat Pro 2 can play up to 24 hours of music, calls, and movies on a single charge and has can be connected to two devices at the same time. You can buy this headphone from many websites online but the best two that I suggest you buy from are HeadsetZone and Telegiants. These two websites are supplying thus headphone at the most affordable price as compare to other websites. Visit them to place your order and explore more about the headphone.