Indonesian currency is rupiah, abbreviated to “Rp”. In 2010 the exchange rate is approximately US $1 = Rp 10 000, (subject to currency fluctuations). Travellers  Cheques are easily exchanged in Lombok, in the cities and tourism areas such as Senggigi. There are moneychangers in Senggigi and Mataram, and on Gili Trawangan. There are also ATM machines in Senggigi, Mataram and outside Hotel Vila Ombak on Gilli T. Credit cards are generally only accepted at larger restaurants, hotels and dive shops.
The Trawangan can take care of your money needs, with foreign exchange and credit card facilities.