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As far as I know nobody makes the M6 Springfield Scout (or an identical copy) any more, and you're stuck buying from private individuals.
The really bad news is I've seen them regularly priced at $1000+ for specimens in good shape. Seriously.
I'm not familiar with the .22/.12 guage model to be real honest; they must be even significantly more rare than the .22/.410 model. I shudder at the asking price for such a thing....
Or you can buy a Savage 42, brand new in .22/.410 for about $449, and a lifetime supply of ammo.