If you have a e-reader (like Kindle) you can subscribe for free to BookBub. They will send you an e-mail each day with a list of free or low cost books you can download based on the genre you specify. If you like mysteries you'll get suggestions of mysteries etc. You can also borrow books for free from Amazon Prime on your Kindle and as said earlier most libraries have e-books that can be downloaded for free. Amazon also has a list of 100 free books that changes all the time so you could check that out as well.