I have blonde highlights, but want to dye my whole head so that it's closer to my natural color with is a dark blonde/light brown. I have extremely fine hair and don't want to damage it anymore. Are there dyes out there at either a drugstore or at Sally's Beauty Supply that I can use on my hair without turning it green?

I don't think that the dye would turn your hair green. You should try a hair dye like L’Oreal Natural Match No-Ammonia Color-Calibrated Crème Hair Color. It's no ammonia formula is more gentle on the hair and has lots of natural oils and conditioners to pamper the hair