I love looking for and finding online courses to take in my spare time!

Here are some of my favorite resources:

You can search and register for online classes at several different universities.
- https://www.edx.org/
- http://oedb.org/open/
- https://www.coursera.org/

This is an aggregator of different online learning sites where you can sign up for courses.
- http://courses.skilledup.com/courses

For business management you can actually purchase real Harvard Case studies. It is a great method of learning and won't cost you a ton of money.
- http://hbr.org/case-studies

Hope this helps & best of luck!