I google this and have tried many results, but usually get crap sites. Are there and good, reliable ones?
Walmart.com has 500x500 cover images. And Amazon has everything that Walmart doesn’t, but usually in smaller sizes.
Second for Amazon and WallMart. Most bands also have websites and they often have cover art on their discography pages. Applications like Music Match Jukebox can query the CDDB and retirieve album cover art. However the images are small and usually won’t scale up well enough to print a full size CD cover, if that is what you want to do.