I had 100 copies made of our last album, on CD-R's, about 6 years ago, and I can assure you they are still playable, I've just checked one.
I really wish I could remember the name of the duplication company I used ( it was something obvious like CD Duplication Ltd, and they were UK based ), as they were super efficient, helpful and cheap. Not a music-oriented company, probably more into software distribution, so probably no longer in business 😞 . However, they understood how to make playable, music CD's
With cardboard sleeve, printed back and front, and the CD printed on too, it came to about £150.
I'm sure the market's changed a lot since then though.