Update

http://store.kobobooks.com/en-US/ebook/to-love-a-dark-lord-1

Well, I was a bit too hasty.  Apparently you have to enter the promo code stockup30 to get the 30% off, but the good news is that lots of books are on sale as well.

And I just heard that Mary Stewart has died.  I'm almost as upset as when my own mother died (at about the same age).