OK, so here are the links:
Booksweeps Free Books
Amazon's deal of the day - Books (not always free but discounted)
Bargain Booksy check out their deal of the day.
My personal favorite E-books Habit. Sign up for their email and get free books offers in your mailbox
Prolific Works has free books and you can get notices in your mailbox too.
And this easy to remember site: FreeBooks They have a ton of categories!
If you have a favorite site that I haven't mentioned, please leave a comment and share with me!