I'm very pleased to discover that the "Limited Edition" (haha) double-CD with both of these casts is still available. Stetson Productions was responsible for the original 1978 New Zealand cast with Gary Glitter, so this is straight from the source:

http://stetsongroup.com/merchandise.htm

NZ$30.00 for the 1995 New Zealand RHS CD by itself, or NZ$50.00 for the Limited Edition Double CD with both 1978 and 1995 New Zealand RHS casts. NZ$15.00 for international shipping. Just under US$50.00 equivalent at the moment, for the double-CD with shipping. Well worth it, I think.

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Shawn McHorse
RockyMusic.org / AustinRocky.org