Amazon[amazon.com] has a B2G1 offer on select books, games and blu-rays. Free shipping with Prime or $25+ order.
Follow the link and use the search to find Ghibli titles. The best deal is to get Spirited Away, Mononoke and Nausicaa, making Spirited away free. The other movies are more expensive (and also not as good, IMO). Comes out to ~$11 per movie before tax. Other combinations increase total.