Originally Posted by bensheimer
Is there a plugin I have not found yet?
Yes there is. There is a sticky post at the top of the Plugins forum that has an Index of Plugins
. Scroll down to the Metadata Source plugins and you will find it.
When in doubt glance up at the sticky posts at the top of the various calibre forums for possible answers. Unlike other forums, calibre's forums, for the most part, have nice concise posts filled with information.