There seems to be no supply of NSP2 scopes anywhere. The most common are the Polish ones. there are Russian, Czech, East German, Hungarian and Polish from what I understand. There may be some for sale in Europe you would have to look at EU surplus dealers.
A year or two ago Polish NSP-2 were sold by 150 PLN which is now ca. $40 + shipping in Poland.
Now I can see only one incomplete NSP-2 for 250 PLN which is ca. $65 + shipping in Poland.
I've had one but it was dead, I couldn't make it work but friend of my used the one which he bought - so it is the lottery about condition of demobil NV scopes sold on the market.