Celery root is not inexpensive at all. It is because of all the fame it gained for its amazing advantages. When people found out that celery root is low-calorie and can be eaten as a substitute for high-calorie vegetables, it became popular worldwide.
As a result, its prices went up high. Another reason because which this price escalation happened is terrible weather in the places where it grows. So it becomes difficult to transport those from one place to another.