Please describe the "perforated aluminum". What size,
shape, form does it come in? Hardware people don't always know
what you are talking about.
Have the hardware people look in their McMaster-Carr catalog. My
copy lists two pages of perforated metals in the index. They’re
located right after the wire cloth in the catalog.
Everyone should take a look through a McMaster-Carr catalog at
least once, just to see the amazing variety of products
available to industry. Much useful stuff if you "roll your own"