As Amazon Prime's catalog has improved, I've bought fewer videos in the last few years, even as prices have plummeted. (Whole series are selling now for what a single season used to cost!) Good news for my closet space, but to the collector in me it seems so ephemeral. When the copyright on The Sopranos lapses a few hundred years from now, my DVDs and Blu-rays will be in the public ___domain. Meanwhile, Amazon could lose its license before I get halfway through season three.