Leatherbound is a cool, free app (iPhone and iPad) for finding the price and availability of e-books. It's meant to keep you from searching for just the book you're looking for among the mountains of Kindle, Nook and iBook offerings. Once you find a title, give it a tap to compare its listing on the various stores.
It's pretty neat, and you can check out the demo below for a look at what it does. Leatherbound is free, universal and in the App Store now.