Actually the most expensive is $16000, for Ultimate 2010.
That depends on where you buy from and wether you subscribe to MSDN.
If anyone goes to college/university for anything related to developing software you might get it for free though MSDN AA.
Wrong.
First, it's called Dreamspark.
Second, it doesn't have to be related to developing software.
Third, it's the cheapest you get for free then.