Amazon offers Back to the Future Trilogy: 40th Anniversary Edition Blu-ray for free shipping with Amazon Prime. 

Product Description:
Experience one of the most popular movie series of all time like never before with Back to the Future: The Ultimate Trilogy! Join Marty McFly (Michael J. Fox), Doc Brown (Christopher Lloyd) and a time traveling DeLorean for the adventure of a lifetime as they travel to the past, present and future, setting off a time-shattering chain reaction that disrupts the space-time continuum! From filmmakers Steven Spielberg, Robert Zemeckis and Bob Gale, this unforgettable collection features hours of bonus features and is an unrivaled trilogy that stands the test of time.