Your best bet is to find your local real estate investment group and talk to the realtors there. The general BP forum won't necessarily be in your local market. Good luck!
@Carlos Alexander Don't wait for them to expire when you'll be competing with 10,000 agents and investors. Contact them before they expire like this:
1. Go to zillow
2. Search your area of choice
3. Click "newest"
4. Skip to the last page (I couldn't find a way to sort oldest-newest)
Now you have all the old listings that nobody is bothering with. If you want to call them copy the address into a reverse address search to get a number. Or you can mail them. Or you can go knock on the door and leave a note if they're not home.