I only buy archival (flac) downloadable files. Some places I've purchased music from..

- https://bandcamp.com/ - https://us.7digital.com/ - https://www.qobuz.com/us-en/shop

If I can't find them there I will grab the audio off youtube or hit the torrents. Used to buy CDs and rip them, but those are getting hard to find (and it was a PITA).