Trulia: National Home Prices Heat Map
Real Estate website Trulia provides a weekly heat map of home prices in the United States.
Trulia uses Google Maps to give users a quick view of the average listing price in every U.S. state. The tabs at the top of the map allow the user to switch between heat maps of the average listing price, the median sales price and Trulia popularity.
If you click on any of the states you can view the total number of homes for sale in the state and the average listing price. If you are interested in purchasing a new property at the moment then the cheapest prices are available in Ohio, but then that might be because it is a piano.