A side-effect of the move away from physical media to streaming media has been the great deals you can get on compilations and box sets.
Streaming media is a horror, of course, along with any of the super-compressed file formats. CDs have gotten their share of criticism over the years, but the quality of many of them is quite good. I also find that the quality of the hardware you need to play them gives pretty good value for the money compared to vinyl, which is still the best readily available media.
Here’s a selection of box sets I’ve picked up on Amazon lately, along with the price-per-disc I paid. They’re not all still available, but other bargains show up periodically.
(These aren’t all available still; and if they are, not at these prices necessarily.)