Forum user admiralstupid spotted a great deal that's running at Amazon.ca. Right now, you can get Planet Earth: The Complete Series on Blu-ray for $30.99.
Not only is this a savings of 75% off the regular price, but the series will also ship for free via Super Saver Shipping.
This 11-part series has a 4.5 star customer review on the Amazon.ca site, and is #11 in their bestselling DVD titles. Planet Earth is well known for fantastic scenery and cinematography, and would make a great addition to any film collection.