There's an app (or two) for that! Goodwill has a "bin" store nearby, and there are literally a dozen people waiting around to dig in to each new load-out. Pulling books, scanning them with their phone, and, often, rudely tossing them onto what you're digging for. Used books is quite the industry. IMO, way too much work for way too little $$$. Or I'm just lazy. I have at least a 1000 books here, and if I took the time to list and sell each of them, might be able to buy a new radio or two!