Would you be interested in a bike with a take-apart frame that fits in a standard-sized box or case so you don't pay airline oversized fees getting to and from Guatamala?
I have a retrofitted steel Trek frame that doesn't fold, but bolts together, and works with 26" wheels and cantilever brakes. (It uses the Ravello travel bike frame system.)
Also, how tall are you, and what size are you looking for?