Is there a reason you want to take classes instead of self-study? If you're interested in self-studying, MIT OpenCourseWare has a lot of useful classes. I'd also check out https://www.cs.cmu.edu/~10715-f18/.
Not quite what you asked, but there's a post: "The Best Textbooks on Every Subject" that seems like it can help.
I'm considering taking remote non-degree-seeking graduate classes for ML. What are the best schools for that in terms of ease of admission and low costs?