I'm confused about all of the versions of the New Moon DVD Release!

It seems like BOTH Target and Walmart have thier own versions of the Twilight: New Moon DVD coming out in just 10 short days (YAY!). Is this normal? Is it worth getting BOTH versions because they each have special limited edition components to them? Are their any more special edition versions of the DVD Release than these two stores? HELP PLEASE! Thanks a million in advance!