Just a thought but maybe try some fabrication shops. I know I *could* get some mirror-polished aluminium through work but last time I looked into it the cost was... prohibative. Granted that was for 16ga and over a year ago though. Maybe try for some 20ga or lighter? One thing to keep in mind, at some point the price actually goes UP with thinner material.
There is also mirror polish stainless steel but again... not cheap. I'll double check what the technical name for that finish is and post so you can at least take a look at it.
Chris
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