Keep in mind that most things on Amazon are price-matched from other competitors, so if you don't have access to Amazon deals or are a part of some rewards program on some other website, I recommend checking other competitors' prices through Google.
So, as of late Amazon has been placing more and more anime related content on sale ranging from movies, OVAs, complete series, etc.
To see more deals for Amazon Prime members:
click on the link
click on "Anime" that is a part of "Movies & TV › Boxed Sets › Anime" directory which is located directly above the Cowboy Bebop box image
than in the "refine by" option on the left of the screen, click on the Amazon Prime image, so that only Prime deals are displayed
Some decent deals include: