Goodreads Can Tell You When Ebooks Go on Sale
You can get sale alerts for all the books on your Goodreads “want to read” list. Whenever one of them is discounted on Kindle, iBooks, Nook, Google Play, or Kobo, you’ll get an email. (This only works for ebooks, not physical copies.)
On the Goodreads web interface, go to your account settings and click “Deals.” Select “Deals from my Want to Read shelf.” You can also get collections of deals according to author, genre, or popularity, but that can clutter your inbox.
With these settings, you’ll just get alerts for the books you explicitly want to buy.