G.W.
I'm also a brunette who pays $140 ever 3-4 months for color/highlights. I have quite a bit of gray to only be 35. It just runs in the family. Anyway, to keep the cost down from going in every 6 weeks, I buy that Loreal (I think) Root Touch Up. It is an awesome product. It gives you just enough color to hit the greys and tide you over for a few weeks. It's very easy to find a shade that will be pretty close to the color of the rest of your hair. You can find it on the hair color isle at Walmart. It's great that for about $6, I can buy myself a few more weeks before forking out the big bucks! LOL