Well if cleaning and calibrating gives you good value then you saved a piece of change. That is all that is done by rebuilders.
By calibrating I mean they verify flow pattern and delivery volume, they have no way of doing anything about it except an ultrasonic cleaning with special chemicals.
Here is the best of the tools used. We have one and they do a good job. WE charge about 25 an injector except we usually just bundle it in the diagnostic time:
http://www.asnu.com/