I bought my place five years ago from a
very motivated seller. He lives in Missouri, the property is in Washington, and he was tired of dealing with deadbeat renters while living so far away.
Each time I spoke with him, he dropped the price a thousand dollars (stopping at $6,000 off his original asking price). He pretty much let me name my terms and even put it on a thirty year contract (apparently he has a much younger wife

).
My payment for my home and five hillside acres is less than my son and his wife pay for a one bedroom apartment in town.
Granted, I was lucky (right place at the right time and all that), but I would think with the housing market the way it is now, you can find some desperate sellers. Just remember, though, that if you find a place that's listed with a real estate agent, your down payment is more than likely going to have to be enough to at least cover the commission. My place was a "for sale by owner" - no real estate agents, no bank. Everything was done by a title company.
One thing I did (and which I highly recommend) is to assign the collection to a bank. For $100.00 initial fee (which I gladly paid) and a small handling charge each month (I also willingly pay), I make my payments to a bank. They process it, record it, compute interest, etc. and cut a check to the seller. No questions about payments being made or received.