Note: Most courses are for free, and they only charge a fee if you want a certificate they can send you. Some others have a fee, but still they are rewarding.
These are the kind of courses you will find on Coursera:
Powerful Tools for Teaching and Learning: Web 2.0 Tools
Foundations of Teaching for Learning 2: Being a teacher
The Reflective Practitioner
Leveraging Student Thinking
Lesson Planning with the English Language Learner in Mind
Foundations of Virtual Education
Do take a look at Coursera; it is worth it!