For the last 20+ years, my favorite sci-fi/fantasy author has been Lawrence Watt-Evans. His books are not always profound, but they just fit my brain. He's currently writing a sequel to his 1989 sci-fi mystery Nightside City.
The catch is that he's writing it one chapter at a time and holding future chapters hostage until he gets enough donations. His goal of $300 per chapter is both reasonable and steep, depending on your point of view. He justifies it thoroughly in his FAQ.
If you've ever read one of his books, or just enjoy sci-fi, or have ever used one of my modules and feel you owe me