http://www-graboid.com works for me. There should be a lot of sites though.

prison break season 4 episode 1, 2 & 3
1)http://www.allybox.com/watch/tv/prison-b…
2) http://video.supernovatube.com/play.php?...
3) http://www.cucirca.com/2008/09/09/prison...

Following sites are reliable and unintrusive to watch this showhttp://www.WatchShowsOnline.TV
sidereel.com
surfthechannel.com

Go with the first answer. Sidereel.com/prisonbreak. It has a selection of videos for one episode from different websites just incase one doesn’t work very well.

prison break season 4 ep 3 is good =Dhttp://www.cucirca.com/2007/05/06/watch-…
Why the thumbs down?

hey
i use http://www.iprisonbreak.com to watch prison break seasons
its always up to date and good quality
check it out

sidereel.com (best i think)
alluc.org
freetvonline.com
peekvid.com
tvduck.com
freetvlinks.com
there are loads but these are really good
love prison break going to have to catch up on this season also
hope this helps=]

http://www.sidereel.com/Prison_Break
there is lots of links for every episode on this site.

Try hulu.com or iTunes.