Online Bookshops

There is a wide variety of more ethical online bookstores than Amazon: They differentiate themselves by donating to charities, cooperating with local bookstores, having explicit no-DRM policies, or just being non-billionaire owned, responsible businesses. Some sell both, physical and electronic books, others only one particular type. Some specialize on a particular type of literature, others are generalist stores.

Please note, that many older works of literature are in the public domain (differs by jurisdiction), and therefore free to download and share (legally) as ebooks (i.e. there is no need to buy them from a bookstore).