There are not all episodes of the program on Youtube; some of them are missing. I also checked iTunes, but only first 3 season were available to be purchased. I also don’t own a TV because I live on campus of an university.
I really want to watch all of them. Is there any way to do this?
A quick Google search seems to show that only seasons 1, 3 & 4 have been officially released on DVD, anything else is a bootleg/homemade. According to Wikipedia the show appears to have very complicated rights issues:
I hope it gets resolved, I think the show is great too!