If it's a RealtyTrac listing, it's not a price at all. In fact, the property probably isn't even for sale, and it may never be. Or if it was for sale, it's probably sold. In other words, RealtyTrac "listings" often are misleading, inaccurate, outdated, and just plain wrong.
The "price"--as others have already said--may be for one of the mortgages on the property. That has no relationship to the property's value or what it might sell for.
If you're interested in buying a property--foreclosure or otherwise (and don't limit yourself to foreclosures)--get a Realtor. Work with that Realtor to find a property. The Realtor's information--unlike RealtyTrac's--will be accurate and up-to-date.
Oh, and as Dan says, you don't have to pay for this information. A Realtor will give you the accurate, complete information for free.
Hope that helps.