Oppenheimer was a GREAT series (it was the first thing I saw Waterston in) and it is too bad copies aren't available. A similar situation exists for "Glory Enough for All", a British series from around the same time, about the discovery of insulin. I would pay a good price for both of these on DVD. Is it really so difficult to get Oppenheimer on a DVD that is able to be played in the US? Another very enjoyable series, again from about the same time, was "Danger UXB". A series about defusing UneXploded Bombs, hence the name. That one you can get from your local library.
Pete