There are many spots to obtain a SIM, some of the most reliable places are the supermarkets. Supermarkets have stands out front that sell SIM cards and can also add data for you. There are also many local SIMPATI stands that sell SIM cards and data. These are not like the cell service stores you may be used to at home but offer the same service. So find a local market or ask someone to point you in the right direction of a SIMPATI store. Rememebr you also need to purchase data to use the local SIM!