A house in foreclosure will usually be sold through the legal system rather than a real estate agent. In my area it is a sherrifs sale. Once the legal work is settled there is a public notice in the newspaper listing the sale date. This information would be available through the county tax office. In a more populated area, the sale may be handled differently since they would happen more often.
Find out if you have to pay any taxes. I may be wrong but I think there are certain cases where the previous taxes have to be settled before posession of the house is taken.
These homes are often not available for inspection- buyer beware- sold as is.
You can get a great deal this way. Just be aware of the potential risks and expenses.