Your best bet for locating foreclosures are as follows:

Searching the county records for lis pendens. Lis Pendens means " pending notice of legal action" is filed after 3 or more mortgage payments have not been paid.

Read the legal sections of the newspapers. IT will tell you what properties are heading to the county courthouse, gives you sale dates, lien amounts, etc

Drive around the area your interested in, look for signs of abandoned or empty properties and search them out.

Get on your local MLS ( Multiple listing service) and see what bank owned properties are for sale.

I would not subscribe to any foreclosure internet sites. From my experience i feel it's just been a waste of money.Foreclosure information is usually general knowledge available to the public and it doesn't cost you a thing

SAVe your money!

First off there is no real site that can actually fulfiil what your looking for unless you know exactly what that is. Meaning there are so many sites that are selling foreclosures, sites that sell lists, sites like these mentioned before are all good sites if you know how to use them. You need to know what your looking for because you might not even need these sites to get what want. Or they might still be inadequate. If you can provide more detail upon what actually are looking for. Foreclosure is such a broad term these days, and there are so many branches of this, detail is better so we can direct you in the right direction.

I agree with Diane, we used Realty Trac.
Here are some other government and private lender links that might help you out in your research
USDA property for sale
http://www.resales.usda.gov/
Real Estate for Sale by US Government Site #1
http://www.firstgov.gov/shopping/realestate/realestate.shtml
Site #2 http://www.homesales.gov/homesales/mainAction.do
IRS: Real & Personal Property Sales: http://www.ustreas.gov/auctions/irs/
Acquiring a VA guaranteed home foreclosed by states: http://www.ocwen.com/reo/residential/res_reofindbystate.cfm?…
Homes and properties being sold by the different departments in US Government:
http://www.hud.gov/homes/homesforsale.cfm
USDA Properties for sale all states
http://www.resales.usda.gov/sfhdirect/sfh_prop_main.cfm
GSA Government Auctions on personal property
http://gsaauctions.gov/gsaauctions/gsaauctions/
GSA Government Auctions on a State by State basis (personal Property)
http://www.surplussales.gsa.gov/
FORECLOSED PROPERTIES BY PRIVATE LENDERS
Chase Bank foreclosures
http://mortgage.chase.com/pages/other/co_properties_landing.jsp
Country Wide foreclosures
http://www.countrywide.com/purchase/f_reo.asp
Bank of America foreclosures
http://bankofamerica.reo.com/search/
Regions Bank foreclosures
http://www.regions.com/personal_banking/property_for_sale.rf
NationStar Mortgage
http://www.nationstarmtg.com/Realtors/FindAHome.aspx?state=ALL

RealtyTrac is the #1 foreclosure site. However, it is not altogether accurate. They list properties that are pending foreclosure as well as those that are in foreclosure. It's a 4 step process. Not all their information is accurate, thus their stats are grossly over estimated.