You can probably find one. There are varying shades of henna. Just make sure you use body art quality (BAQ) henna. I buy my henna from Henna Hut, but there's also Henna Sooq. If you go to Henna for Hair they have everything you need to know about henna.

One thing though, henna will not fade and is next to impossible to remove. They say the only way to get rid of henna is with scissors, so it's a big commitment unless you're not opposed to cutting your hair.