Harvey, SA TO GO and NVDA are free.  You don't need to spend a dime for 
computer access or software upgrades or optional screen readers any more.
Those days when your adaptive technology has to cost more than your computer 
are thankfully long gone.
The world, technology, and market are constantly changing.
Their are situations where Jaws and Window-eyes may still be necessary, but 
you don't need those screen readers, unles their is something you can't do 
with a free product.