Just a few places to check out, Dunes
http://www.southwestalliance.com H.U.D. Homes New Mexico & Texas
http://www.HomePath.com Fannie Mae Foreclosures
http://www.HomeSteps.com Freddie Mac Foreclosures
http://www.hud.gov Nationwide H.U.D. homes
First of all, there is no particular place for you to go and purchase pre-foreclosure properties. You must track lis pendens, which is public record, then negotiate with the homeowners to make it happen. There is quite a bit of competition here, not for the faint of heart." For the savvy investors, it's a source great business.
Regarding Auction or REO Properties: auctions are advertised in the legal section of the local newspapers, while most REO properties will eventually reach the MLS through an agent.
There are quite a few companies like Realty Trac and Foreclosure.com that provide access on a subscription basis. Like the previous response indicated, their timing might be off.
Most REALTORS provide their clientele with this kind of information in some form of daily email alerts. Please feel free to contact for more specific details.
C. Lloyd McKenzie, MBA, CDPE, e-PRO
"Lloyd & Associates," Allstar Realty