Superman: The Motion Picture Anthology, 1978-2006 (Blu-ray) for $55.99 shipped.  Here is a screenshot for your reference.  Alternatively, it is also available here for $58.97 shipped as shown in this screenshot.  This 8-disc set features Superman The Movie, Superman The Movie: Expanded Edition, Superman II, Superman II: The Richard Donner Cut, Superman III, Superman IV: [...]