Books
OK, so you’re not going to retire on the sale of something popular and mass market, like that everybody-and-their-uncle-bought-it paperback of Dan Brown’s “The Da Vinci Code.” But there are diamonds on those shelves, if you know what to look for.
Older hardcover books in great condition, signed first editions and other rare reads are your best bet. If you know a certain author well, you can probably keep his or her rarities in your head.
