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Yep. They're out there. They're commonly known as split-rail converters. You can get them as a non-isolated version (TI TPS65131, for example) or with transformer-isolation between input and output as in the Mean Well DKM-series that I use.
Those of you who wonder what the big deal is with the Canadian manufacturing will likely find this post informative as well: HPA-10 ASR Review - Post #40