How much do Udacity courses and Nanodegrees cost?

Udacity has around 200 courses that are completely free (but do not offer a certificate). 

Udacity’s Nanodegrees (micro-credentials exclusive to Udacity) are completely paid. These Nanodegrees currently cost $399 per month, or you can pay for several months upfront for a reduced amount. If you cancel your enrollment within 7 days of signing up, you may be eligible for a full refund.

Here is a list of Nanodegrees with their pricing.

If you cannot afford the cost, Udacity offers a limited number of scholarships for particular Nanodegrees. Here is some information about Udacity scholarships: https://www.udacity.com/scholarships