Best Buy again offers Planet Earth: The Complete BBC Series on Blu-ray Disc for $19.99 with free shipping. That's tied with our August mention as the lowest total price we've seen for this BBC series. (It's also a current price low by $3.) Sales tax is added where applicable. This 4-disc set includes all 11 of the 50-minute episodes from the series. It's narrated by Sir David Attenborough.