The prices have been raised since a year ago it seems
https://www.reddit.com/r/Udacity/comments/bjndpz/udacity_alters_price_of_all_nanodegrees_to/
Edit: I don't think it is worth it at the moment.
Edit2: I am currently searching for alternatives on coursera, datacamp, free courses on udacity and the free courses on kaggle. This is what I am considering
https://www.coursera.org/specializations/python-data-products-for-predictive-analytics
https://www.kaggle.com/learn/overview