I use ebooks!! There were only a few classes where the book wasn't available (assessment, nutrition, the very first class, and one other book that is escaping me). I usually just google "ebook ISBN #". I've had great luck with Kno
for the last 3 classes (leadership, diversity, and global health). I also had ordered one book from Barnes and Noble/Nook (I think that was family health, unfortunately for that one it wasn't iPad compatible, so I had to use my laptop). I also ordered 2 directly from Elsevier (community health and gero), they also have their own app. Elsevier was a little trickier because it didn't come up in my google search right away. I eventually found it by going directly to the Elsevier website and searching their ebooks (if I remember correctly, those classes were a while ago).
I absolutely love it. All of the apps I've used have had highlight and note functions. I also love that I can use the search bar. It makes discussion posts so much easier. And my very favorite part is that I can wait until the day the class starts to buy my book. They usually download in less than 10 minutes.