If you bleach your hair yourself :)
I want to buy the Schwarzkopf BlondMe Bleach and Developer, plus a couple of Wella Illumina Colours and a corresponding developer as I am not confident it diluting developer myself. Comes to £101 at Sally Beauty though!
Are there any other reputable sites to buy salon quality products from? I do not want to use Amazon as I've just heard there are lots of fake products floating around out there.