Have you tried the Health food stores? I hear they sell organic dyes.
ThreeSixty in Elemets sell organic uk brand called tints of nature. There were few blonde shades in selection and also a highliht kit.
How was much was Tints of Nature? HealthGate sell an organic brand called Naturcolor for $142, and if they don't have the shade you want, they can order it for you.
If I remember correct tints of nature dye cost about $170. I only bought the hihglight kit, which was $195!