Update: Season 5 is now streaming on Neflix as of April 1st, 2013! http://www.netflixfixer.com/2013/04/eureka-season-5-comes-to-netflix.html
Lots of people are asking and searching for Eureka – Season 5.
Unfortunately it’s not on Netflix, and only a trailing window of shows is available on Hulu without Hulu Plus.
If you do have Hulu Plus, you can watch the whole thing, otherwise there is currently 5 episodes available: http://www.hulu.com/eureka
On Amazon Instant Video, all 5 seasons are available in HD for a cost: Eureka Season 5- Amazon Instant