My favorite book is a little known one called “Black Holes and Timewarps: Einstein’s Outrageous Legacy” and I reference it so much that I would really like a copy that’s fully mine and searchable, but I also care about the author receiving compensation for the purchase. Where do you get your PDF copies from?
Your local library might also have a “book edge” scanner that lets you scan books easily.
Just know it’s a pain in the ass and slow as hell so maybe it’s worth it to pay someone else to do it.