Not sure which company you are referring to? Best for you to contact a buyers agent in the city or town that you are interested in. Rent to own properties are not as common in fact when I ran the term "rent to own" in our mls only 4 came up in the entire state, 2 in worcester (1 has an accepted offer), 1 in springfield and 1 in framingham.
Just because it is not listed like that in mls does not mean that a good agent can't find one for you. Good luck.