Planet Earth complete series on high-definition, region-free Blu-Ray from Amazon.co.uk (Amazon's UK website) for £10.99. US-based Amazon.com accounts work on Amazon.co.uk. During checkout, the price may change to £9.16 for US customers. Add £3.08 for standard shipping to the US, for a total of £12.24. Purchasing with a US credit card will charge you about $20. Most other stores, including Amazon.com, sell this Blu-Ray set for over $50.
The majority of DVD and Blu-Ray discs purchased overseas will not function in US-based players. This particular Blu-Ray though is region-free, meaning it will work on all Blu-Ray players worldwide, including US players. Many reviewers on Amazon.co.uk confirm this 5-disc Blu-Ray set works in US-based Blu-Ray players, including a Playstation3.