Where can I rent BBCs Planet Earth on Blu-Ray?
 

I just got a PS3 and wanted to watch Planet Earth on Blu Ray but not buy the whole thing as I will probably only watch it once. Does Blockbuster or Netflix rent Blu ray movies and if so do they rent Planet Earth? Any suggestions?

Or is the whole series worth buying and is it something you would watch more than once?

You can definitely get it from Netflix. They have probably 98% of Blu-Ray's currently in release.

Don't know about other stores, but PE has been one of the most popular high-def titles so far, so I have to imagine some local stores would carry it as well.

Netflix. But be aware that the Blu-ray version does drop the "Making of" featurette after each episode that is included on the DVD. These "diaries" are usually about 15 minutes and are just as interesting as the episode itself. :(