And once more (because my brain is working slow this afternoon) referring to what @stuartk typed: yes: definitely do a search on Music Direct’s site. Just type in SACD for your search engine and start scrolling through the pages. I have done that and seen quite a few classical releases on SACD hybrid. Just make SURE that if you order, what you order is DEFINITELY a hybrid (most of them are) and NOT a single layer SACD.
As of late I have been trying to develop a taste for both classical and jazz, and as an example of the former, I recently bought a couple of remastered by "Living Stereo" and "Opus" that were both hybrids. (Before "Living Stereo" got into hybrid SACDs they were also doing the 20 bit rd book classical remasters, ’Witches Brew’ was one, so you might want to do a search on ebay using that as a search engine also.)