ArkivMusic has had a licensing agreement for many years with a number of classical labels and classical divisions of the majors for at least ten years or so, to produce copies of selected OOP material on demand. Presto Music does that as well for a number of titles, and occasionally I see a note on Amazon that a title is available as a CD-R on demand. Arkiv and Presto reproduce the entire original liner notes and art, I have a number of their issues and never had a problem with them. No experience ordering an on-demand item from Amazon. I'd be afraid they might use MP3 as the source, since that's what they have as their download and streaming options haha! Amazon went down the toilet a number of years ago IMO, so I avoid them when possible. Shipping is unreliable since they gave up on UPS only and went to horrible rinky-dink "couriers" lmao for much of their deliveries, and their packaging sucks. I miss the days of books and CDs shrink-wrapped to a cardboard backing fitted into correctly-sized boxes so pages wouldn't get crumpled and CD cases wouldn't get smashed. Time marches on! lol
Edited to add: I have always made my own CD-R as well as a FLAC image/cue backup just in case the on-demand CD-R might not last. Another note, the Presto discs I received were not CD-Rs, although the liner notes were clearly NOT factory-style prints--they were Deutsche Grammophon, and didn't have the metallic gold imprinting on the cover that was done for the original DG releases haha! So perhaps for the most-requested/ordered reprints, they have a commercial run of discs made, and do CD-R for the low-volume titles.