If you've not jumped into the modern World of Darkness yet, the setting of games like Vampire: The Masquerade and Werewolf: The Apocalypse has a big digital bundle sale on that'll stuff your to-read pile full of tabletop RPG books so fast. Just. Very fast. There are a lot of them: Something like 25 full-on books and adventures, with a slew of extras, stories, and bonus stuff to go along with.
You can get that $544 value for about $40. Plus, maybe, some shipping.
If you're in the United States...