Dyson is notorious for not discounting its hair tech. Most of the year, even during big sale periods, the max you can get off a product like the Airwrap is £50 in a Boots Advantage Card deal – but that isn't the case this Black Friday.Though Dyson is yet to announce any discounts on hair electricals, I've just found out about a 'secret' deal that can give you up to 50% off an Airwrap.