Today only, amazon has the complete documentary (26 hour series) of the World at War for $36.49. This would make a great gift for a history buff.   

Buy.com has the hit series Weeds Seasons 1-4 for $9.99 each.  There are lots of other series available for cheap at buy.com including Full House season 1 for $8.99 so stock up.  I find these make great stocking stuffers for my husband. 

The Discovery Channel Store has Planet Earth DVDs and Blu Ray discs on clearance for as much as 80% off!  Some of the discs are as low as $4.99.  Use coupon code: TBDVD199 and any DVDs for $4.99 are marked down to 1.99 (including the blu ray Planet Earth shown above!)  Also, they are having a 3 for $30 deal on dvds that includes popular tv series on dvd and the Brainy Baby series.  If you spend over $59 you can get free shipping with code: FS59.  Earn 5% cash back on purchases at the Dicovery Channel Store with Ebates.