The most common method is to pick up the book, look at the spine and/or cover title, check the index for a specific item, and then check for the price. I’d like to share a strategy to approach a new title that will enable you to use it more effectively...
Carolyn Barkley offers examples of why the initial approach may not work. She concludes her blog entry with
A thorough examination of a new resource is essential to its effective and efficient use. Consult the title page; don’t rely solely on the information on the spine or cover. Look at the table of contents to understand the organization of the content. Thoroughly read the introduction and/or preface to gain an understanding of the scope of the book as well as find the tips the author may provide about how to best use the resource. Consider the index carefully to understand what is being indexed and how the index entries relate to the text. I guarantee you’ll be able to put the information in the source to much better use.
I wonder if she's a librarian at heart?
"Because I love bookstores. Spending afternoons wandering the shelves. Happening across great books I didn't even know existed. But it's an experience I never found online. Online bookstores are wonderful. They've got amazing prices, huge selections, and they're open all the time. If you know exactly what you want, they're perfect. But somehow I kept coming back to the bookstore just to browse. Zoomii is my attempt to bring online as much of the real bookstore experience as possible.