It's becoming clear that if you plan on buying every season of a TV show, at least the more popular ones, you might want to wait a couple of years (if you can wait, that is). They're coming out with more and more "complete sets" and if you buy the sets individually you're probably paying more (and missing out on some extras, though that's not always the case).

Here's another one. CBS/Paramount will release a complete set for Star Trek: The Next Generation on October 2, to celebrate the show's 20th anniversary.