Which skill is easiest and cheapest to get to 99 in runescape?

I want to get a skill 99, i dont care which as long as its cheap and easy. I would like to know how much it would cost approximately and how long it will take me.Which skill is easiest and cheapest to get to 99 in runescape?Cooking should cost around 2.6m (using cooking gauntlets) and should take around 40-50 hours.