It somewhat depends on your learning style and goals.

Do you learn better by reading, webinars, or by face-to-face seminars?

Are you looking for learning about new or complex subjects?  Or are you just wanting to keep up-to-date on things and get the required credits?

I use Checkpoint Learning to watch webinars.  The person who presents most of the update classes (including their monthly tax update) is amazing at how up-to-date she is with things (but the other presenters vary in how much I like them).

If you are just looking to get increase the number of classes to get more credit hours, CPA Academy has lots of free classes.