 All episodes of Seasons 1 through 5 are available for purchase in the U.S. at the iTunes Store, PlayStation Network, Amazon Video, and Xbox Live Marketplace.In an aggressive marketing campaign by NBC, the pilot episode was released across a broad range of media from satellite broadcasting to popular social networking websites such as Facebook, shown on United Airlines flights, freely distributed on video on demand on about 30 cable and satellite systems including Comcast, Time Warner Cable, Cox Communications and Dish Network, on Yahoo, and from Amazon Unbox.Also, prior to the airing of "Chuck" in the United Kingdom, the pilot episode was released as a free temporary download on iTunes.