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What do you mean by a non-reversable mirror? You can buy a mirror that does not cause confusion between top and bottom from any mirror shop, mirrors that do not confuse right and left are more difficult to find. Or do you mean a one-way mirror that is a window when viewd from one side and a mirror when viewed from the other? They are usually similar to ordinary mirrors but without an opaque layer behind the silver layer. As for where you can get one, damned if I know, but you could try one of those spy shops, you know, the ones that sell bug microphones in lampshades and secret cameras in pens and the like, or maybe a police station outfitters - sorry this is not much help...