History / "The Struggles for Poland" - the documentary series, where to find? [3]

Does anyone know where I can find a copy of the documentary series "The Struggles for Poland?" It aired on PBS in the late 1980s. I remember watching it as a teenager when I first began to develop an interest in my Polish heritage. If I remember correctly it was rather well done. I'd love to watch it again, but I can't seem to track down a copy. I'm sure it's out of print, but there must be some copies somewhere.

Thanks, W