I've been obsessed with 1.Outside recently, so here's another.
This is an exclusive DVD, part of a set of twenty DVDs. In each, David discusses the whole story of 1.Outside. The series was originally 32 discs, but cuts were made because he didn't want to give "too much" away. Those who buy the boxed set get the special bonus disc which explains the music videos of 1.Outside. Said bonus disc is not available any other way. And, of course, the boxed set would be released six months after the individual DVDs.