SEATTLE, July 18, 2011-(NASDAQ: AMZN)-Today, Amazon.com announced the launch of Kindle Textbook Rental-now students can save up to 80% off textbook list prices by renting from the Kindle Store.

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Result: More than one-fifth of Orlando's rental units are vacant, landing it the top spot on Forbes' list of America's Emptiest Cities.

MSN: Orlando, Las Vegas top the list of emptiest U.S. cities

Next, make a list of the phone numbers and Web addresses for your travel agent, airline, hotel, rental car company, and any other travel related contacts.

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To construct our list, we ranked cities over all four quarters of last year by single-family and rental vacancy rates, then averaged the ranks to determine the top 10.

MSN: Orlando, Las Vegas top the list of emptiest U.S. cities