Mailing Lists Real Estate

I saw on real estate homes for Yahoo $ 100 / $ 500 / $ 1000. I know you can not buy a house and lot for that price?
These the homes are seized, but I know you can not buy a house and lot for that price. What is really happening here? I tried to email the agent rooted in the list, but give me an answer now. All information on this will be appreciated.
They forgot one thousand dollars.