Susan e Jeremy

This is a movie we had to see with our class. Most of the times these movies were dull and boring, but then... they send us to "Jeremy". And I still am looking for a chance to see the movie again. I remember that they showed it on television in the mid 70's, before the VHS era. I recorded the soundtrack on compact cassette (inferiour quality, the recording was lost). I still remember however how the movie touched me, and I still can do the "horse-sound" by clicking with my fingers as Jeremy did. Does anybody know if this movie can be bought on DVD? I am looking for a copy since many years, but cannot find it in Europe anywhere.