You can also ask a realtor for help finding foreclosures.
http://www.freeforeclosuredatabase.com/ It has some free listings, but very annoying as it seems to not list lot sizes.
http://www.reosource.com/ similar to above.
Homes for Sale by the U. S. Governmenthttp://homepath.foreclosure.com/ http://www2.fdic.gov/DRRORE/
By the time you have looked at and through those sites above you will be frustrated and see how some sites are better than others. You can also just look at normal realtor websites. I think most reo's will be listed on them and places like http://www.realtor.com
Try the Bank and Gov. sites created to provide the Public that information...
http://www.nhmsi.com/ ... http://bankofamerica.reo.com/search/propertysearch.aspx
http://www.pasreo.com/pasreo/public/propertySearch.do ... https://servicing.chase.com/reo/property/FeaturedProperties
You can find all the links to the Bank/Gov. sites here....http://www.mortgagenewsdaily.com/wiki/REO_Database_List.asp .... http://www.biggerpockets.com/bank-reo.html
For Tax sales and finding public records please give this FREE search engine a look.....http://publicrecords.onlinesearches.com/Foreclosures-and-Tax