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(Updated July 17, 2020 - also see reader comments in reply to the original post)
The quandary: You want to support someone's new book and as much as you'd like to buy it, you can't. Perhaps you can't justify the cost of the new book right now. Perhaps your author friend is prolific and has multiple books coming out, and you can't afford to get them all. Perhaps you have so many author and illustrator friends that if you tried to buy all their books, you'd need to sell your car first. Or your house.