Caprice,
There are various avenues to search for listed properties that will consider rent-to-own. Your local MLS is a good start. On Nesters.com we have around 500,000 listings nationally with that option (click here to search). There are a lot of motivated sellers out there that explore all possible options - sale, rent-to-own and rent.
Also, it may be a good idea to check whether that tenant buyer can qualify for a mortgage. As long as they have solid income there are programs out there that can get them a mortgage even if their credit is not perfect. Sometimes a better strategy is to find them a short term rental and then get them to buy traditionally in 6-12 months.