There's another nice list of e-book sources developing now in this thread with an iLiad perspective...
https://www.mobileread.com/forums/showthread.php?t=7390
By the way, we now have a
MobileRead Wiki. If anyone has some interest and a little creativity, please feel free to bring some of this great info about e-book sources into the wiki so that everyone can get to it easily. It works just like Wikipedia, is simple to learn, and we greatly appreciate any and all our community Wiki contributers!