Best Buy offers Firefly: The Complete Series on Blu-ray Disc for $14.99. (Amazon has it for the same price with free shipping for Prime members.) Opt for in-store pickup to avoid the $2.99 shipping fee. That's the lowest total price we could find by $11, although it was $2 less in January. This 4-disc set includes a gag reel, all 14 episodes, three behind-the-scenes featurettes, four deleted scenes, and audio commentary for select episodes.