Amazon's current Blu-ray Boxed Set of the Week is for the
National Geographic Ultimate High Definition Collection (
Atmospheres: Earth, Air & Water,
Extreme,
Journey to the Edge of the Universe,
Kingdom of the Blue Whale,
Relentless Enemies and
Rhino Rescue), which can now be had for $34.99 (59% off MSRP), or $7 per documentary. This is the cheapest this six-title National Geographic documentary box set has been. This offer is valid through December 25.
Thanks to forum member "shinseiromeo."