to piggy-back off of the previous answers, if you're not looking for a Realtor to help you out, I would also suggest watching the sheriff's sales that occur once a week at the courthouse. During my rehab days, we used to go to those every session.
Another tactic I've seen used is the "cold call". If you see a property that you think might be open to your proposal, you simply send them a letter asking them if their house is for sale.
There are lots of different methods. Good luck to you.