if you get the tub of bleach from sallys which is 20 and get arctic fox hair tubes which are about 13 a piece, trust me you could do it. Those bottles go such a long way. My hair might be a bit shorter but one 8 oz bottle literally last me 3 touch ups! So much easy than like 5 to 6 boxes that cost about 5 bucks a piece everytime I dye my hair
Arctic Fox Hair Color- Vegan & Cruelty-Free