Britney Spears Onyx Hotel Tour Hair Color?

Does anybody know of a box dye that is very similar (almost exact) to the hair color that Britney Spears had during her Onyx Hotel Tour. Not the blonde but the brown hair that she had. And brand of box dye will work. If you know of one that is that exact color or almost exact please tell me the brand and name of the color. Please and thank you! :)