$5 · The Random House Encyclopedia (so much more than just a book!)

You may say, "It's 2025, I don't need a paper encyclopedia", and you'd probably be right. But, hear me out: this 12 lb (5.44 kilogram) beast is nearly 4" (10 cm) thick. 1) It's an impressive-looking addition to any library, especially without the dust jacket. (I'd recommend the bottom shelf, unless your bookcase is particularly robust.) 2) It presses flowers with ease. (Warning: may also press small pets and toddlers.) 3) Hollow it out, and you can store your valuables in it. Or small pets and toddlers. (Air holes are recommended.) Caution: misplacement of the book may affect the rotation of the Earth.