Yesterday I thought "I should probably grab one of these used copies for around ~$12 before they disappear". This out of print edition of Beyond the Valley of the Dolls is the only way to hear Roger Ebert's commentary track for the movie.
The real danger was that they would surge to insane prices. The least expensive used copy on Amazon is now $50. I wish there were a feature on Amazon that allowed you to report price gouging abuse and block yourself from unintentionally buying from sellers in the future.