[watwut]

Did you tried coursera classes? Some of them are bad, but if you choose carefully you can have great learning experience. The way teachers work, difficulty and quality are very different, so there is high chance there is one that would satisfy you.

[jjoonathan]

The problem is that coursera classes thin out dramatically as you reach the graduate (or even middle/upper undergraduate) level of whatever topic silo you are interested in. CS might be an exception, but the offerings in large swaths of chemistry and physics are extremely meager and I imagine that's the case in, say, biology, the humanities, etc.

Universities have precisely the opposite problem: professors love to teach high-level classes in their fields of interest but they don't particularly care for the intro-level classes.