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.
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.