I use Clairol Born Blonde Maxi and I love it. Its about $9
That is everything you get in the box
Since I am only doing my roots this time I am going to use this bowl and brush I bought at Sally Beauty Supply so I can have more control. I mixed it in the bottle shown above then poured it into the bowl
After applied to my roots, and roots only, I always put on a shower cap, obviously that isn't stylish but the heat from your scalp helps speed up the process and avoids any messes while I wait.