Saw it on Netflix Instant Streaming and watched it on a whim...loved it!!  Watched the entire series and was dying for more.  The movie does a good job of wrapping up the loose ends that Fox left behind when they dropped the show...idiots!!  Even got my wife hooked on it and she's not usually crazy about Sci-fi stuff!!

After you see the movie, I suggest picking up the two or three graphic novels (basically hardcover comic books)...especially The Shepherd's Tale which really gives you the background story behind Shepherd Book...great stuff!!

As far as I know, there is only a resin kit of Serenity...but it sure isn't cheap!!