http://novoed.com/ and http://futurelearn.com/ offer free fiction writing courses from time to time (novoed's was last in the fall).
Also, The 2015 season (Season 10) of Writing Excuses podcast was formatted as a "Master Class". It's available on their website.
Some libraries have a subscription to Gale courses, and there's a fantasy writing, a romance writing, and a novel writing class there IIRC. My local library (SF, CA) does. It's included with my library card.