Best demographics to use for Sub To direct mail and best sites for data

I’m following $'s Sub To system and just wanted to get opinions on which people have had better results with for data and which demographics.

Which sites works best / cheapest for the data I need above?

http://www.infousa.com
http://www.usadata.com
http://www.melissadata.com
http://www.dataquick.com
http://www.sitexdata.com/

AND (thanks to Michael)

http://www.listsource.com/

OR

Does anyone have any other sources (preferably FREE)

Your question may be better answered in the Real Estate Marketing forum.

try www.listsource.com

As for sub-to deals in a over leveraged market you may want a more generic marketing piece. Sub-to seems to fall in your lap once you know the debt to value ratios.

Locke wrote a course on the subject… Ping him

Michael