Any commercial HVAC ductwork gurus? In need of....

Looking for used spiral ductwork, something around 30" diameter give or take and I need about 30 feet and one 90 degree elbow...

OR

Someone that can fabricate a roof penetration through classic rib roofing metal. If I do it I am sure it will LEAK!
If I had the roof opening set up then I would only need about 10 feet of spiral ductwork and a rain cap...

My apologies if my terminology isn't correct....

Im located in Taylors, SC but can travel to pick up supplies.....Ive been searching for used ductwork for a while. New 10 foot sections are a ridiculous price!