edistotommy

i am very interested in getting a trial bike and getting into riding. i have encountered a problem though. i am from the United States, but currently live in Colombia, South America. how do i go about getting a bike down here? any help would be greatly appreciated. i would like to get some opinions on which bike i should get. i understand that that there are two different sizes that i have seen, but what is the main difference for the size differences? like i said, any help would be greatly appreciated. thanks