Yes, we do sell the correspondence course books and DVDs on Amazon. We believe you can also get Joe Kubert's other how-to-draw books on Amazon, too.
As another suggestion, The Kubert School Art Store has lots of how-to-draw books available, including ones from Joe Kubert as well as other prominent artists. Here's a link: www.kubertartstore.com/books/
Just remember, any other how-to-books you get won't include assignments (like our correspondence courses have) that you can do from your home anywhere in the world and send to us that get critiqued by our staff of professional cartoonists. Having your work critiqued by pros is an amazing and unique opportunity that will definitely help you improve your drawing abilities!