Did you know that if you see a e-book on sale at one online store, there’s a good chance you may be able to find that same title in your preferred format at the retailer of your choice? Many books are put on sale by the publisher and not the retailer, and in those cases, you are likely to find the sale price on another site.
For example, today the Nook Daily Find is Alex Bledsoe’s The Hum and the Shiver: A Novel of the Tufa (Tufa Novels Book 1) for $2.99. Since I prefer to read on my Kindle, I looked on Amazon for the book. Sure enough, The Hum and the Shiver is also $2.99 today so I bought it there. The book is also available at Google Play, Kobo and iTunes for the sale price.
This doesn’t always work. Sometimes the book prices are discounted by the store, not the publisher. Some stores are slow to change prices. I have often seen sale prices at Amazon, Barnes and Noble, and Kobo that weren’t reflected at iTunes, but the prices carry over often enough that it is worth the extra step of checking at your preferred vendor.