I would say go to a chemistry store. Here in Peshawar we have a store that sells chemicals in small quantities for the purpose of as an example making jam at home or shebat, and chemistry labs etc they sell methanol there... I am sure you have some similar store in Karachi as well.
you can check with a school that teaches FSc level classes, their lab wala will be able to tell you where they get their supplies from... that's the place where you will find methanol.