I personally use apple cider vinegar to get rid of any problems I have with dandruff. Apple cider vinegar is pretty cheap, depending on where you get it; I have gotten apple cider vinegar for as little as 2 dollars. When I am having any issues with dandruff, I first wash my hair with shampoo, then apply a mixture of apple cider vinegar and water to my scalp and finally use conditioner. I have also heard that tea tree oil can be used to get rid of dandruff, but I personally have never tried this. Finally, there are also some shampoos you can buy to help control dandruff.