You can find a lot of interesting books FOR FREE at
www.booksontheknob.org. They offer free books for kindle, nook, epub and sometimes audio. All you have to do is sign up with your email addy and they email you. If you don't have an ereader but don't mind reading at your computer you can download the kindle and nook aps for free.
ALSO, Nook does free Fridays but that is a bit trickier as you have to go to barnes & noble web site or the nook facebook page to see what is free.
I have found some decent books and a few cookbooks for free.
If it is FREE it is for ME!