Amazon offers The Dark Knight Trilogy: Ultimate Collector's Edition on Blu-ray Disc for $38.99 with free shipping. That's the lowest total price we could find by $41, although we saw it for $9 less last fall. It includes Batman Begins, The Dark Knight, and The Dark Knight Rises, with collectibles such as Mattel Hot Wheels versions of The Tumbler, Batpod, and The Bat.