Free or Inexpensive Online University Classes
Yes, there are all kinds of free courses from some of the best professors in the world. Plus, there are websites that present these courses.
Free or inexpensive-
Free- One of the best sites with free e-books, textbooks language lessons, business courses and K-12 educational course if you need some pre-requisites.
There are too many to include them all, as I have featured some of the best websites for compilations of resources.
What is most important is what you do with the courses. Finding authentic ways to demonstrate learning might look like the regular writing assignments, projects and examinations of the course, but it also might involve more creativity on your part. Documenting such learning in an electronic portfolio is paramount.