You get a bottle of gas from one of the gastrucks that do the rounds of the area. First time you pay the fee for the botlle, which I believe is QRS 200.- per bottle. After that you just pay for the refill QRS 15.- Also there might be a small fee for first time installation if you need hose & regulator. Or you can buy these from any supermarket. The gas truck people do not always have the hose & regulator. So better be prepared and buy them ahead.