I should have been more specific. The CLUTCH master cylinder can be had for around $40. I forget the fellow's name, but he advertises on Ebay fairly frequently. The particular clutch master cylinder on our cars is not all that rare, and according to him Girling did some smart consolidation a while back.
I'll dig around for info, but it might take a few days. I'd just set up a search function on Ebay for clutch master cylinders. He doesn't seem to advertise all the time, but pops up from time to time.