have these discs (either sacd or DTS) ever become available individually
AMAZON UK has the individual SACDs w/DVDs ... unfortunately also PAL format. They also stock remastered CD format ... NOT SACD, but the same Nick Davis remixes in regular old stereo. Improved sound quality over the original releases, but no 5.1 ear candy. That said, by the time you paid the individual prices, you'd end up paying MORE. Even if you wanted to "settle" for vinyl, that costs $30 more than the box set. Better off just getting the box and tossing the DVDs ... or holding on to them just in case you ever get something that plays PAL.
Here's an example. I found the Lamb, standard cd, Nick Davis remix. (are you sitting down?)
http://www.amazon.co.uk/Lamb-Lies-Down-Broadway/dp/B001BDZHZS/ref=sr_1_18?ie=UTF8&s=music&qid=1233945797&sr=1-18
** And don't worry about the bad review. That's one person who's probably p!ssed about having to pay that much for it ...
Plan B: You could sit back another 30 years and wait for the direct psychometric aural sub-cranial interface package to be released.