Within a few cents of it's all-time lowest price, Serenity on Blu-ray can be had for just $7.00 flat at Amazon right now. This movie (and the entire Firefly series) is a must-own in my book. It's some of Joss Whedon's best work and certainly worth your $7. If you don't trust my recommendation, instead listen to the impressive 4.5 star review average compiled from over 2200 amazon customers.