Linux $0, *BSD
$0, 
OpenOffice.org $0.  And you don't have to be a
 student or teacher.  It's the same price no matter what TLD your email
 address is behind.
 
 I would disagree with that - nothing is free. My time is worth something,
 and unless you are volunteering up your free
 time to support, it ain't free. 
 
My sanity and stress-level is worth something too. And having had
dealings with the so-called 'support deparetments' of several companies
including M$, I have ocme to the conclusion that it's quicker and cheaper
to support things muself. Although actually, I've found the support from
the authors of free software to be a lot more helpful in solving prolems
(whether caused by a bug in their code or not) than any company I've had
dealings with.
  Second, I work for a multi-billion dollar company, and
there is NO WAY on
 this earth any minutely-responsible IT
 department is going to run ANYTHING unsupported in a production environment,
 especially with SOX and other
 requirements. 
And there is no way I am going to use anything I can't support myself.
Which means I won't depend on any hardware I don't have full schematics
for, I won't depend on any software I don't have the source code for. I
don;t require it to be 'open', I don't mind if the schematics and source
are not freely copyable and that I have to pay to get, say, a technical
manaual containing said schematics.
-tony