Whoa, Amazon has the BBC version of Planet Earth on sale for ~60% off...$30.49 for the DVD and $40.99 for Blu-ray.
Note: this edition features the original narration by David Attenborough
Sigourney Weaver, I'm really happy for you and I'ma let you finish but David Attenborough was one of the greatest Planet Earth narrators of all time. Of all time! (What, too late?)