A Foreclosure is a legal proceeding that takes place when a property owner can no longer make payments on his or her loan. Each state has it's own process to handle foreclosures.
Some agencies list foreclosures in local newspapers or publications.
Some agencies contact local realtors. You can get the information from Foreclosures - Auctions that will give you the names, addresses, phone numbers and websites of agencies throughout the United States. Each state and agency has it's own procedures for the sale and purchasing of foreclosures.