UPDATE
Katie Price changes her single strand hair extensions to suit her current style. Currently the model, businesswoman, mother and reality TV regular sports medium length, jet black hair extensions. This year alone she has worn 4 styles (to our knowledge): ultra long black, curly black, dark blonde and baby blonde (the latter at her book launch).
The PR phenomenon, known for her eye for a bargain, buys her single strand human hair extensions from an online supplier. They have a London Salon and advertise widely on the internet.