Currency in Svalbard and Jan Mayen to Norwegian krone (NOK). For 10 US dollars you can get 87 Norwegian kroner. For 100 US dollars you can get 870 Norwegian kroner. And the other way: For 10 Norwegian kroner you can get 1.24 US dollars.
And if the trip plans are simply for a given region of the world, then maybe it will come out cheaper than in Svalbard and Jan Mayen in nearby countries? See prices in: Finland, Iceland, Sweden, Aland Islands, and Norway.