Deep Discount is having a buy one, get one free sale of Fox/MGM dvd
sets, including Firefly, Buffy, Angel, X-Files and Stargate.
Firefly is listed at $34.99, so if you get two of those, they're about
Sale ends 12/16/07.
Amazon has Serenity (the new Collector's Edition, with lots of new extras) for $8.99.
I don't know how long the sale will last.