Since many of you took advantage of the last promotion, I have just been notified that several DVD boxsets of popular TV shows can be had for up to 53% off on Amazon.com: Desperate Housewives, Greys Anatomy, Ugly Betty, Dexter, Lost, Entourage, etc.
In addition, SFF titles such as the Matrix installments, Heroes, Batman Begins, Stargate: Atlantis, Stargate: The Ark of Truth, Stargate: Continuum, The X-Files, Alien, Planet of Apes, Buffy the Vampire Slayer, Angel, Millennium, Dark Angel, Roswell, etc, can be purchased at up to 58% off.
There is also a Blu-Ray deal: Buy 2 titles and get one free. So you might want to browse around and see if there's anything that strikes your fancy. . .:-)
Though, as a matter of course, they don't offer the same deals, I found stuff discounted at up to 63% off on Amazon.ca and 67% off on Amazon.co.uk.