The major points are that you have to go beyond just searching the comments section in the MLS for "lease option" or "rent to own" or "contract for deed." There are other ways to find many of them in the MLS. And there are many that won't be listed in the MLS at all.
And there are plenty in your general area that aren't on the MLS. Here's a Craigslist search for "contract for deed," just as an example: http://minneapolis.craigslist.org/search/rea?query=contract+
Hope that helps.