/ jetboil gas options
There are loads of shops you can get Gas from in Cham, you won't have a problem picking any up, just make sure it is the screw type.
There are 4 types of common gas cylinder:-
1. Pierceable ones, all the same in terms of fitting, whether Gaz or otherwise. Won't fit a Jetboil straight off, though depending on the shape of the Jetboil you might be able to purchase an adapter. Becoming less common as they're quite dangerous if misused.
2. Screw-fit type, fit almost anything except Gaz - these are what you need. Don't know about availability abroad but as they're so common I would think they would be.
3. Gaz push-fit type, only fit Gaz, no use to you.
4. Blowtorch push-fit type, fit those cheap, larger stoves that look like a quarter of a normal kitchen gas hob, again no use to you.
Prepare for some stress on your wallet. Screw type gas canisters are expensive in Cham.
but yes pierce cartridges can be dodgy, more likely to freeze your hands of than exploding, unless you are smoking a fag while doing it!