I've heard that it's currently not available. I was lucky and got mine about a year and a half ago. I would think Disney might make another video available as it gets closer to the 50th.
I just ordered a DVD titled Disneyland Resort Video Guide on Laughingplace.com a few weeks ago. It is a couple of years old, obviously something they made right after California Adventure opened but enjoyable. A little pricey with shipping however. I ordered for my little nieces aged 3 so they can see how the characters look next to real people to prepare them for their first trip.