Try the University of New England's distance medical biochemistry course. They send you a box containing the book, several DVDs of all the lectures, a notebook including practice tests and study guide, and a return envelope for the DVDs when you have completed the class. You can begin any time you want. I completed the course in February, and I am happy with my choice.
Make sure the schools you are applying to will take those. I know the Florida schools all say they will only accept traditional classroom based classes for the required classes (and most of them require biochem).
You probably know this already, but just an FYI as I didn't until a couple months ago