Can you buy the whole series together? If not, Are there any plans to bundle them together anytime soon?

Yes, you can buy them all at one time http://www.amazon.com/gp/product/B0009E322U/ref=imdbpov_dvd_2/002-6613853-9272015?ie=UTF8

I think it is just the three seasons apart but on one bill. It isn't like the Complete Combat with one box

Thank you!