It's time to start thinking about your summer vacation-- and if the digs are FREE perhaps it will last all summer long. Thanks to the recent popularity of home rental apps like AirBnb, Americans' preference for home exchanges over pricey hotel stays has increased rapidly over the last five years. If you can save money without sacrificing comfort, why not? But there are numerous options besides AirBnb and VRBO. Depending upon your style and budget you may want to consider: Home Exchange, Love Home Swap, Bohemm or Thirdhome to name just a few. For in depth coverage on these options, check out the January 11th edition of the Wall Street Journal.