This link will take you to a different site for ebooks. Not all of them are free but they are all cheaper than you would usually pay
This is the link to where you can go to sign up for free Kobo books. They’ll since you a list of 15-20 links per day. A lot of them are first in a series and they range from Romance to Sci-Fi and Fantasy, Kids and Teens, other fiction and non-fiction.
I don’t know how well it’ll work for non-Kobo users since the links take you directly to the Kobo Store but it’s worth a shot, isn’t it?