Just upgraded to a 4K monitor last month so I've become a lot more insistent that my ebooks have the highest quality book cover art I can find -- I just happened upon a very awesome source I thought I'd share in case some aren't aware of it. If anyone has any other locations to share, would much appreciate it
http://www.penguinrandomhouse.com/
Just search for the book and click "enlarge cover" button -- It will then give you the option to download high-res copy. The size averages 5-20mb each, varous resolution. (The 22mb one I just grabbed was 1621x2442)
I also occasionally hop over to amazon or b&n , find book and click it to give preview, then do a screen cap and quick crop in paint.. Between those 3 and all the sites calibre searches, I'm rarely stuck with a low res cover anymore. Takes a little work but worth it imo, as I love my eye candy
