I have a Kindle -- go to Amazon.com and look up "e-books"...and you'll see how many books there are. I buy the $.99 up to $5.99 books. (I save my money for fabric!)
Our library is going to be hooking up with Kindle soon -- then I'll have access to ALL their books. I haven't had any problems EXCEPT....my debit card was accessed. Had to change my debit card in the online purchasing site at Amazon. Every time I order a book I get a notice that it can't access my debit card.........I get the book, the money is taken out of our account, but I still get that message. I've become adept at deleting the message!