The BOMC Sondheim set is ok, but hardly worth $540! Even the booklet was somewhat disappointing.
As for DROOD, I would advise against paying this kind of money for it. I suspect that in time Decca Broadway will reissue it. When Universal bought up MCA and Polygram they obtained the rights to DROOD but at the time of the merger the masters were licensed out to Varese/Sarabande. A while back, Brian Druteman at Decca was asked about this but he thought with 2 previous CD editions it would not sell that well. However the show is done a lot at regional and community theatres so that might create enough demand.
I just checked the Varese/Sarabande website. MANY of their cast albums are no longer listed including AS THOUSANDS CHEER, THE BEST LITTLE WHOREHOUSE GOES PUBLIC, BRING BACK BIRDIE, COLETTE COLLAGE, DRAT! TEH CAT!, HENRY SWEET HENRY, I DO! I DO!, LUCKY SRIFF and NO WAY TO TREAT A LADY. If you want any of these better get them when you see them. I expect HENRY SWEET HENRY and BRING BACK BIRDIE will bring in big bucks before too long.
Cast albums are NOT "soundtracks."
Live theatre does not use a "soundtrack." If it did, it wouldn't be live theatre!
I host a weekly one-hour radio program featuring cast album selections as well as songs by cabaret, jazz and theatre artists. The program, FRONT ROW CENTRE is heard Sundays 9 to 10 am and also Saturdays from 8 to 9 am (eastern times) on www.proudfm.com