Justice League Unlimited DVD confusion

Hey all,

I am having some trouble figuring out the JLU dvd releases.

I purchased JL seasons one and two. Good. The other day I purchased Season 1 and 2 of JLU but couldn't find a season 3 boxed set.

I looked up the Season 2 set on Amazon and one of the reviewers called it the final season of JLU. The problem is Wiki says there are 3 seasons.

Is the JLU Season 2 boxed set actually Season 2 and 3 or what?

I would look at the episodes on the back of JLU Season 2 dvd but it hasn't arrived yet.

Any help would be appreciated.