Found this site albumart. They have a huge collection from ordinary cool to extremely legendary album arts. I’ve searched for Black Flag cover art CDs (31 search results), Fugazi (69) and Pink Floyd (772 – well this is awesome). Surely these guys have the important ones.
I’m not sure how these guys manage their time collecting (or maybe even borrowing) these album arts and scanned it all over. I bet they have a high resolution scanner or at least ones that able to perform fast picture scanning (not mine).
Check out their site here.