In my experience, Rent-to-Own properties typically occur in rural areas where the lifestyle is much more laid back and some sellers feel like being neighborly in helping someone buy their home. I grew up in a rural area where this is still often found. In urban and metropolitan areas it is rarely found and the best way to find one, if it exists, in your area is to use a Buyer's Agent to locate and vet them for you before you even go see any property. It will save you time, money and potential headache if it turns out to be a scammer that "stalks" potential marks. Plus, a Buyer's Agent will be able to negotiate the best price for you because they have no emotional attachment, other than getting you the best deal they can.
Hope this helps!