I looked into swiping cover art from Amazon for the Beatles remastered albums, but Amazon has a new zooming feature that makes it hard to do because the image gets sliced into 400x400 chunks. After some sleuthing into the image URLs, I was able to get full covers at 600x544. Here's how I did it.
1) Pull up the product page for the album.
2) Find the ASIN number. You can find it lower on the page, or as part of the URL (it starts with B).
3) Paste this URL into a new browser window.
http://z2-ec2.images-amazon.com/R/1/a=[ASIN]+s=RMTILE+va=MAIN+e=.jpgCopy the ASIN number from the product page and replace [ASIN] with the ASIN number.
4) Load the new URL to see the cover art at 600x544.
5) Save, copy, or do something with the image so you can add it to your MP3s later.
That's my process. Let me know it there is a better way. I know that assembling the zoomed chunks would result in a slightly larger size, but 600x544 is good enough for my purposes.