Once again, the key ingredient to a good bookstore is its selection. And the selection of used books (not to mention software and music) at Half Price Books is far and wide. In fact, its store on East Northwest Highway in Dallas is so big, this book lover's companion recently made the mistake of taking a trip into the store's "paranormal" section and wound up vanishing into thin air. It took a good hour for her to reappear with body intact, book in hand and, after checkout, bank account still padded.