itunes cover art

If itunes can't find the cover art, what is the best way to do it? I'm sure I could go to amazon and save the file but that seems there any other way? drag and drop?
google the image, select all the tracks of the album, open the 'get info' window, drag and drop to the square for album art.

There are a few programs that do this in batches but in my experience, none of them work properly.
There is a program called "Fetch Art" that does this automatically for you. At least on Mac's it does.

Thank you. That works very well.

That appears that it would work but doing the manual thing will work. Thanks though!