I can rarely afford to buy new CDs, so second hand shops/sites, etc. are a God-send as far as I'm concerned. If I pick up something in a chariddy shop, then my money is going to support a good cause, too
I do like owning the physical disc itself, so will always try to find a way to get my hands on a CD ahead of simply downloading an album ... call me old-fashioned, if you like ...