Batman Begins (blu-ray) $9, The Dark Knight (blu-ray) $9

Amazon has discounted a couple of movies from the Batman series. Free shipping with Amazon Prime (free student account) or orders over $25. Check Slick Fillers for inexpensive items to help you reach $25 minimum.
Batman Begins (blu-ray) $9 (list price:$29)
The Dark Knight (blu-ray) $9  (list price:$25)