Library is heaven for book sellers

Here's A Really Long Look at the book sale in Cherry Hill, NJ. "I don't read 'em. I'm just here for the money," said Nathan Ellis of Little Egg Harbor Township, who attends more than 100 sales a year. Some trade in volumes so they're willing to make change or a buck on a single book. Others require substantially higher margins. Serious book sellers these days pack their PDAs with a database subscription service that allows them to scan the UPC or ISBN (international standard book number) that generally appears on a book's back cover. Instantly, the number reveals how much a book is worth on the used market.