I find eBay to be a GREAT place to shop for used CDs. If you want it, likely someone out there has it for sale.
If you can’t find it on eBay, Discogs is also a great option.
Streaming is very convenient, but since I’m tired of subscriptions and I want TOTAL control of what I listen too, I purchase CD’s (& vinyl) and rip them to flac files. Then stream from my NAS. I have a Bluesound Node, an NAD C658 and a Wiim Ultra. all are great, budget friendly options.