Before I begin, I can say that, all of these can be bought from Amazon. 4.00 to 6.00 for a used book, this includes the price of shipping. No book before the 12th New jedi Order book can be bought as an Audio CD, anything before that is audio cassette, which I don't have so I ignore that. Most Fate of the Jedi books can be bought audio CD, while some don't have that option. The problem is Audio CD is usually 10-25 dollars, this includes shipping price and yes, used. So this can get expensive. Which books would be worth shortcuting, ie, paying for the CD instead of the book? Either because they are long or hard to comprehend/understand? I hear Vortex is long, and is one I would consider taking the shortcut.