I would NOT give that site your credit card. Foreclosures are listed with realtors like any other home for sale, so you can find information on them for free. They will be listed in all the usual places any other house for sale would be.
I used to work for a realtor who specialized in foreclosed homes, and my mother is a realtor who deals with normal buyer/seller deals. There are some big misconceptions about trying to buy a foreclosed home:
You're not going to get the house for some absurdly cheap price. Banks set the listing prices. They've lost enough money on the house already, so they're not going to take some really low ball offer on it. In fact, in my experience the banks were LESS flexible and not as willing to negotiate on the price as most private sellers.
The deal is not going to happen any quicker than a normal sale. In fact, they usually take LONGER. When a foreclosed house is a sent to a realtor to list, they have to assess the condition of the home themselves. Banks do NOT do big, thorough inspections on the properties or do much of anything to get the house in a salable condition. So once people come in and make an offer, they have to have their own inspectors look at the property, and 90% of the time, they will find that expensive repairs need to be done. So in trying to buy a foreclosed home, you will usually be taking on a big project. Most of the time these places have not been kept in good condition and no one has been at the property in months, and sometimes years.
Bottom line: if you're looking to buy a home, don't look exclusively at foreclosed properties because you're not going to get any better of a deal on them than a normal private seller owned home.