Including all 16 episodes of the third season, the set also featured DVD extras such as bloopers, episode discussions by the writers, a featurette on the various effects used on the show, and a digital copy of the season.[90] The set was ranked No. 6 in DVD sales for its week of release, selling 104,979 units for $4,093,131.[91] It slipped to No. 18 the following week with 35,593 units for $1,387,771.[92] Though sales increased in the third week—40,034 units for $1,560,926—the set fell to No. 19,[93] and was bumped off the top-30 list by the fourth week.[94] The season was also released in Region 2 on August 25, 2008,[95] and in Region 4 on September 30, 2008.[96] A three-disc, region-free Blu-ray box set was later released on November 11, 2008.[97]