From the Comedy Central Press Release:
The all-new “South Park” episodes from this season are available in HD exclusively on Xbox LIVE, iTunes, Sony PlayStation Network, Amazon Instant Video and Vudu, and in SD on Samsung Media Hub and iN Demand. Episodes are also available on SouthParkStudios.com.
Voted “The Greatest Animated TV Series” in a poll conducted by Entertainment Weekly, COMEDY CENTRAL’s “South Park” launched on August 13, 1997. The series airs Wednesday nights at 10:00 p.m. and repeats later that night at midnight (all times ET/PT).