This Friday, Amazon has an interesting Blu-ray related deal of the day: up to midnight PST, you can order
Rocky: The Undisputed Collection on Blu-ray for only $37.99 (62% off MSRP). This works out to a little over $6 per Rocky movie. The price history for this box set shows that the lowest it has been is $47.99.
Update: this deal has expired now.