I ended up buying the DVD with the documentary on it and I think it's wonderful. Although this is coming from someone who loves all of the behind the scenes extras on pretty much all the DVDs but this one definitely goes more into not just the happiness of what Potter is/was, but what real-life worries the cast has for their future post-Potter (mainly the kids, but some of the adults chip in as well). It's pretty moving, so I'd definitely consider getting the DVD with the documentary on it. To answer the question about WHERE the documentary is, it IS only on the Special Edition Blu-Ray DVD EXCLUSIVE to Target stores, so the only place you can get it is AT Target.