YOU NEVER KNEW YOU COULD SWAP ONLINEPopular Science (Magazine) - 7/1/2006 by Kate Ashford
PaperBackSwap.com has around half a million titles. List nine books to begin trading. At FrugalReader.com, five listings gets you into play. On both sites, you pay only the postage on orders you send ($1.59 for 16 ounces or less by media-mail rate).