Hi Brian,
Re DVD 70 years of S&T. I have this set and it is really great. To look back at the issues post war and see all the nice goodies available is really neat. I wish I could get my hands on some of this stuff. Love it.
S&T in the US doesn't often answer queries, I have found. But I would keep trying though or contact Australian S&T.
You may be able to order it through the Australian Sky & Telescope site.
http://www.austskyandtelescope.com.au/ They may be able to order it in for you.
Cheers Peter