i replaced my master cylinder with a remanufactured OEM nissin MC
may not be the same in your area but in NC carquest auto parts sells the re-man. nissin master cylinders. Mine was 125$ but of course its a perfect fit
I've had my remanufacurred one for a year no no problems
I expect it to last for quite a while
Its not too difficult to do yourself but you have to do it right
if you have a repair manual you should be able to pull it off in say 3 hours and youll only pay for the cylinder and the brake fluid