Originally Posted by joecaption
You can but where you going to find it?
First off, I am not sure I understand what your comment is referring to, or your specific point.
However, to address; The "raw materials" can be found at any Big Box Store and Masonry Supply House. You don't actually buy "chimney flashing" per say. What you do is obtain the necessary metallic materials (including any needed brick, mortar, and sealants), then haul it to the (safely staged) rooftop location, fabricate the flashing components (that make up the necessary flashing system) onsite = and install per spec:
Hope this helps (unless I misunderstood your statement).....