Amazon offers South Park: Seasons 1-5 Blu-ray for free shipping with Amazon Prime. 

Product Description:
Kids say the foulest-and funniest-things in Comedy Central's off-the-wall, "adults only" animated series that quickly became a cult favorite. Join good-natured Stan Marsh, brainy Kyle Broflovski, big-boned miscreant Eric Cartman, and born-to-die Kenny McCormick as they struggle with grade-school life in the twisted town of South Park, Colorado. Voiced by series creators Trey Parker and Matt Stone, and April Stewart, Mary Kay Bergman, Isaac Hayes, Mona Marshall.79 episodes on 10 discs. 29 2/3 hrs. Widescreen; Soundtracks: English Dolby TrueHD, Dolby Digital 5.1, Dolby Digital stereo; Subtitles: English (SDH); audio commentary by Parker and Stone; music video; more.