||OEM master cylinder costs about $250 and one from Autozone costs $50.
||Besides that the one from Autozone is a rebuilt one, is there any
||other reason why I should go with OEM?

I installed a Cardone reman master cylinder on my 1985 Mazda road-race car.
That was about 5 years and countless 120 mph to 70mph braking occasions. Still
works fine. Bought a Mazda new MC last year "just in case" but have had no
reason to change it yet.
Cardone is the only US rebuilder of MCs as far as I know, other than regional
companies. Don't be afraid of this option.
Texas Parts Guy