Best Venue
For a relatively quick sale, list on a secondary marketplace like eBay or Poshmark at $25, ensuring clear, well-lit photos of the signature, the copyright page (showing the full number line), and the dust jacket. To maximize value, place the dust jacket in a clear archival Mylar sleeve, which signals to buyers that it has been treated as a collectible.
Upside Potential
If the book is in absolute pristine, unread 'Fine/Fine' condition and can be marketed through an established rare book dealer network, it could realize the $50 retail high. There is little realistic upside beyond $50 for this specific late-series title due to market saturation.