I picked up a couple of 10 foot by 3 foot sheets of galvanized metal used in duct work from a local heating and a/c company.
It wasn't that expensive and you can ask them to cut it to size or even put bends in it for you.
they are also a great source for old house hold ventilation fans from the furnaces they remove when installing a new furnace.
Junking it cost them money so they are likely to give to to you be nothing.
When I had a furnace replaced the guy even pulled the fan out and left me the wiring diagram as well.
I used it in my vent system over my torch bench and it moves a ton of air and didn't cost me a penny.
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The Zombie Apocalypse is Upon Us.
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