I used to go to a very fancy salon in a very fancy hotel to have my hair colored but I just discovered this stuff
it is so easy and ~$10! Plus there are coupons available on the L'Oreal website.
I do wish they made it in more shades though, I used "40 Pure Dark Brown" which was a tad too dark for my taste.
John Freida makes one & so does Clairol but I have not tried them, though I'm sure they're good too.
What's your favorite hair product?