Rental Data is one of the service provided by MyApartment Maps which lets you find exact rents for any location in US where you want to buy a new house for yourself. What Impressed was the Charts and graphs which they provide helping you to decide according to your budget.  Have a look at how much it costs for  Malibu, CA

Rental Details with Charts and graphs

Depending on which are you want to move it even covers the near by area and city for you. the graphs tells you exactly how much is the variation when you move from one place to another. You can see the pricing for Studio, One bedroom, two bedroom and 3 bed room apartments.

The best part of is the locator which is running  over Google maps and lets you easily move from one area to another by using the mouse and then pin pointing the exact place. The data gets updated as soon as your change the location.

Rental map locator

Overall Rental Data is very nice service and useful if you are in US. The data is taken from their own experience of processing thousands of apartment every day and records rent prices for cities all over the U.S. Give it a try and compare with the sources you have to find exact differences.