Didn't see anyone else had posted this. Simon & Schuster has over 400 titles currently free. A lot of children's titles and novels, with a range of other stuff mixed in including classics (nice editions with extras included), cookbooks, humor and politics (a lot of that is dated). But some nice stuff in there if you have time to look. Unfortunately I don't have the time to give pointers. If you keep going past the freebies there are a lot of bargains at .99 and 1.99. If you're more interested in non-fiction I provided a separate link just for that. No idea how long these will be there.
All titles priced low to high:
https://www.amazon.com/s/ref=sr_st_p...price-asc-rank
Non-fiction only:
https://www.amazon.com/s/ref=sr_nr_n...rnid=154606011