Squeak's idea about checking the court records brings about a possibility of making some real money, if you can find just the right opportunity. Specifically, if you can find where there has been a Notice of Foreclosure filed but the foreclosure is less then complete AND there is equity in the house.
In that instance, you may be able to convince the owners to let you buy the house for the payoff amount --- hence you would get a house with instant equity. The owners may be motivated to agree to this in order to avoid foreclosure.
Again, you need to be careful and have your funds lined up. This is not for someone who is going to struggle through underwriting because you are going to have to act quickly.
A title search AND the purchase of owner's title insurance is crucial. Chances are that if someone is going to lose their home due to foreclosure that they are going to have judgments and/or other liens.