GM-GMC: hydr. clutch upgrade, mech clutch, clutch fork

Question
 I have a'79 blazer with a mech. clutch fork system.  Is there an inexpensive option for upgrading to hydraulic? ie.a used system from a junkyard, or a later model system?

Answer
I am not aware of any 'inexpensive' upgrades to go from a mech, to a hydraulic clutch.  Almost all would involve changing the clutch and possibly the bellhousing, the clutch pedal assembly etc etc.  An offroad website may be able to help you better than I am able to.
Hope this helps