i have been looking up hair extensions for my self, an as far as i can see there are mainly 2 types one set is permenant and the others you can clip in an out your hair as an when you need them. the permenant ones are around �300+ an the clip on ones can cost �14+ a packet but a packet isnt enough for a full head. they come in all sorts of lenghts but i think the longest is 24"
i know all about this coz i was looking them up myself there is a salon in london that does them they do either (real hair) extentions or that horrible wig type hair your natural hair needs to be 6inches or longer and the price depends on the length they can go up to as much as �800. WILL POST MORE INFO FOR YOU WHEN I CAN DIG OUT THE PRINTOUT OF THE EMAIL SORRY BUT I CANT REMEMBER THE SALONS NAME...