Used music CD's

[Drucker]

I rip everything to flac, that's lossless and doesn't use compression but results in larger files.

edit: turns out flac does use compression but is losless https://en.wikipedia.org/wiki/FLAC

^ This, I ripped 300+ CDs to flac, a copy is easily sampled down later for iTunes or whatever. Drive space is cheap do not sell yourself short and go 128 kps or even 320 as the only copy of your music.