Just like the title says. What do you use for quick, cheap, and easy downloading? Bandcamp is the best site I know of for quick and easy downloading, but it's not always cheap. Other than that, I just search random blogs and other sites for whatever album I'm looking for, but I find it's very time consuming, so much so that I haven't downloaded any new music for about a year. I tend to just make these massive lists of what I want, then spend months making playlists, and once I'm done, I don't want to have to do it again for as long as possible.

Bandcamp when I want to pay for it, which is most of the cases eventually. I always buy physical there and it includes a download.

Soulseek or Torrent (RuTracker) when I want to check stuff before buying.

Seconding Rutracker, it has the vast majority of music I need. Always use it if I don't feel like paying for the music on Bandcamp for some reason.
Another good one is metaltracker.

i used to use metal-tracker when I downloaded music, but I now use apple music.