Harvard University will offer three versions of its Introduction to Computer Science course this spring. The course can be taken for no academic credit as a self-paced MOOC through HarvardX. It also can be taken as a credit-granting online course through the Harvard Extension School for US$2,050. A third version, which costs US$350, blends the flexibility of the MOOC course with biweekly, online office hours with senior lecturer David J. Malan and a discussion forum moderated by teaching fellows. This hybrid version can be completed for an official certificate, and the cost is returned in the form of a discount on a future course through the Extension School or Summer School.