Currency in South Georgia and the South Sandwich Islands to British pound (GBP £). For 10 US dollars you can get 7.99 British pounds. For 100 US dollars you can get 79.9 British pounds. And the other way: For 10 British pounds you can get 12.8 US dollars.
When you're thinking about traveling and it doesn't necessarily have to be a specific country, maybe the costs will be less than in South Georgia and the South Sandwich Islands in one of the nearby countries? Check prices in: Falkland Islands, Argentina, Uruguay, Montenegro, and Chile.