There are certainly more with sunroofs than without. But non-sunroof cars aren't exactly rare as hens' teeth either.

For example, without trying very hard on Autotrader, I quickly found 4 non-sunroof cars a few minutes ago: West Palm Beach, FL, Virginia Beach, VA, Raleigh, NC and an MC40 in Tampa, FL.

If I was a motivated buyer for such a car, I'm certain I could find many more between autotrader, cars.com and the NAM classifieds.