One that I am looking very closely at is Anastasia Suen's course. I think it is a great price point.
So I asked around. I hope they help if you are exploring this options. It looks like most people are happy with the classes they took.
Have you taken a class? Who did you take from? What did you learn? Anything you'd do differently?
Here are some comments from the 12x12x12 group:
Posted with permission.
I took the beginning and advanced courses at the Institute of Children's Literature and would highly recommend both. I also took an online course with Jordan Rosenfeld last winter and highly recommend her.