I was looking for "Engineering An Empire" to add to my christmas wish list. Amazon has two versions listed, the "normal" version, and the "collector's edition," which is a little odd for a documentary.
What's odder though is that after the normal amazon discount (however they figure out what that is) the normal version is $31.62 and the collector's version is $28.49. And it doesn't even seem to be behind the scenes type stuff on the collector's edition, the info lists it as having 14 episodes on 6 disks instead of 12 episodes on 4 discs for the normal, with an extra 184 minutes total. In fact i'm not sure, but going by some of the comments in the review of the collector's edition it seems that one of the extra episodes may be the "Egypt - Engineering an Empire" DVD that they're offering on special with the normal version, for a total price of $47.20.
So why would anyone ever buy the normal version? =P