Have you checked out Craigslist?
I'm in the same area as you and check Craigslist from time to time and I have seen mice on there before. I don't know if there's any listed right now, but you might want to keep an eye out.
Also check Petfinder. I just took a quick look using my zip code, and there are mice up for adoption from Brooklyn, NY and also a few in NJ and PA, if you are willing to travel a bit to get them.
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