This sounds cool but apparently it's discontinued?
https://en.wikipedia.org/wiki/Optical_Disc_Archive
https://obsoletemedia.org/optical-disc-archive/
Quick web search didn't find the drive cost but you can get LTO-6 or LTO-7 drives relatively affordably if you're into such storage. Meanwhile, more recent LTO generations seem to have shot up in price, maybe following DRAM and hard discs, ugh.