Get in contact with portfolio lenders/servicers like Green Tree. Keep an eye on the "legal notices" section of the newspapers in these areas to see which lenders are holding foreclosure auctions. That should give you a pretty good start.
The best way to find jobs working on foreclosed properties is to:
1 - Make sure that you are licensed (contractor's license) and bonded.
2 - Start contacting the banks, real estate offices and others to provide them with your information.
3 - Market yourself.