JB Hi-Fi - Seinfeld 1-9 DVD Boxset - $89
This boxset has all 180 episodes from the 9 seasons, so it's a great price even if you do get it shipped for $17 extra. Even better if you can pick up in store.
"One of the most watched television shows of the 1990s, "Seinfeld" is a true-to-life comedy series that follows the events of a group of friends. The group consists of Jerry Seinfeld, a stand-up comedian who questions every bizarre tidbit about life; George Costanza, a hard-luck member of the New York Yankees organization; Elaine Benes, a flashy woman and book editor who is not afraid to speak her mind; and Cosmo Kramer, an extremely eccentric, lanky goofball. Another very notable member of the show is Newman, a chubby mailman, friend of Kramer, and, almost always, nemesis of Jerry. Other sources of comedy appear in the form of the parents of both Jerry and George."