I am looking for an old made-for-tv movie (NBC) from 1984, directed by
Lee Grant, titled "A Matter of Sex".
It is a docu-drama about striking bank employees in Willmar, Minnesota.  
I have been looking for this movie for a very long time and would
appreciate is so much if someone can tell me where I might be able to
purchase this movie.

In the event that no one comes up with an in-stock source for the
movie, you might find helpful some of the ideas and resources posted
in the comments responding to another Google Answer request for a
hard-to-find movie:

http://answers.google.com/answers/threadview?id=23109

Another option would be to sign up on django's website, which does
actually list the movie (although a copy is not available), and then
add the movie to your "Notify Me" list. If they do acquire the title,
you would receive an email indicating its availability:

http://www.djangomusic.com/item_movie.asp?id=V+++127387&dt=&cid=&sid= 

An additional option would be to try eBay's new "Want It Now" site and
post the movie there. If you can't find a copy elsewhere, it can't
hurt to try this avenue, if you haven't already done so:

http://pages.ebay.com/wantitnow/