Why not get a piece of brass, and polish the bejesus out of it? Ancient man made mirror from brass, modern man must be able to...
The way i would go about it is work your way in steps using finer and finer sand paper then at your finest start wet sanding, and wet sand until you hate yourself. Then get your self some HIGH quality rubbing, buffing, polishing, and finishing compounds coupled with a few different buffing/polishing/finishing wheels on an adjustable high RPM grinder and just put hours into it until you can get the highest reflectivity you have the paitence This will be the cheapest way rather than having something custom made.you may have to repolish it up every now and then. But the bragging rights of saying you made your own custom mirror?! Priceless. Plus when someone walks up and says how bad ass your custom brass mirror is tell them you can make them a custom brass mirror and charge them out the wazooo
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