This can be confusing. You are not going to find a house for $20K. You know that old saying.."if it sounds too good to be true"...
If you will let me know where you would like to live I would be happy to help arrange the referral of a great Realtor that specializes in your area of choice.
In my area it is still a very strong buyers market, as is most of Southern California. You have your choice of buying pre-foreclosure listings, foreclosures, short sales, or just plain old homes. Let me know how I can serve you.
Pre-foreclosures that are reported in this manner are NOT currently listed for sale, they are just homeowners who have received notices of default. The services who post these as if they are listed for a sale are just creating more confusion for home buyers.