Walmart offers Firefly: The Complete Series on Blu-ray for $12.96. Choose in-store pickup to dodge the $4.97 shipping charge. (Amazon has it for the same price with free shipping for Prime members.) That's $2 under our April mention and the lowest total price we've seen. (It's a current low also by $2.) This 3-disc set includes all 14 episodes, a gag reel, behind-the-scenes featurettes, deleted scenes, and audio commentary for select episodes.