Is there a site where you can buy electronic books on health topics?

My Dad has trigeminal neuralgia and we recently hunted for books on the subject. We could only find one book on the subject and it was in America so we will have to wait ages for it to be delivered. I thought to myself wouldn't it be great if there was some website where you can buy ebooks for a range of health issues and conditions. Does such a site exist? Then you could get access to the books quickly by downloading them. I've noticed some conditions are hard to find any publications on.

If you mean audio books, barns and noble or boarders have some or if you have i tunes, you can buy audio books and put them in your i pod.