Realty Trac is not listing "homes for sale".....they are compiling public records for properties which have a legal action or notice filed. The amount shown on Realty Trac indicates the amount believed to be in legal dispute. The amount is not necessarily indicative of a sale or purchase price.
if you research the property, you can probably find out what liens appear against the property. In order to pass a clear title, all liens have to be clear. This can happen if the lien holders are paid in full, or agree to accept a lesser amount as payment in full. Comps will provide an estimate of market value.
Realty Trac does not list "properties for sale." Do not assume that because there is a legal action involving a property that a homeowner wants to sell. Many times, a homeowner will seek alternative remedies to the situation. That might be restructuring the debt w/ the existing lender, a refinance, borrowing$$ from family or friends, leveraging other assets, bankruptcy, and....in some cases, error may have caused a filing of a action that will be dismissed. Yes, some financially stressed homeowners may be looking to sell. You might find a few leads at Realty Trac, but expect many homeowner to be unreceptive to any contact or solicitation, if they are not interested in selling.