Unfortunately, no. The smallest pre-hung unit I've seen stocked at HD or Lowes is 18" and they have not stocked them in the past 2 or 3 years. Special order only. I can get that (and whatever size needed) special order through a local lumber yard for half the price and in less than half the time it takes to get from HD or Lowes. Do some looking in the "yellow pages" in your area....
If you can read this, thank a teacher. If you can read this in English, thank a soldier. Support our troops.