According to online book marketplace AbeBooks, there are only 500 first editions of Harry Potter and the Philosopher's Stone. The site claims they can list for as much as $40,000 to $55,000, and the one currently up there is listed at $28,689.89. (But that's only if you're willing to spend the extra $26.46 on shipping. It's too flammable to travel by floo powder.)

If you want to make big bucks off of your copy of the book, you first have to make sure you've got the right edition. "The main characteristics of a 1997 first edition first printing" are the following:

Sources: h/t Bustle