I'm often asked where my books are shelved in a bookstore. And I've discovered my stuff in self-help (!), non-fiction, history, and DIY.
Generally, they're either in the "kids" or "humor" sections. If you want to find the latter, someone once said, "To find the humor section in a bookstore, go in the front door. Now go to the deepest, darkest, most remote section of the store. That's where the humor will be."