These are the very few first results (through Google - I simply searched for "госшвеймашина") - I haven't yet done any "serious" research (and if you need translation of the ads, please write - however, I don't promise speedy responses - a full time with overtime job and family keep me rather busy ;-))
http://club.season.ru/index.php?s=8c...howtopic=24770 - as far as I can see this is exactly the one you were looking for. The cost is 5000 roubles, but the condition of purchase is "pick-up only" (it's in the suburbs of Moscow).
There are also these two:
http://elektrostal.olx.ru/iid-122024441 and
http://www.avito.ru/items/sankt-pete...shina_28063418 but they are a different kind.
I wonder, though, about shipping from/"pick up only" in Russia. My family is not there (they're in Kazakhstan), so I can't help with that. Will you be able to find ways, or should I try and look for them only here in US?