Hi baby, I am from Malaysia. I think I am the only one in this forum who is from this country cause I still looking for cubes in my country and no one has any answer since. I am still new around here and still collecting info on guinea pigs.
So far I only come across timothy hay in a pet store but I'm not sure about other states but there is a link here somewhere that you can find places where to get the hays. It has something to do with horse ranch I think like polo club or something.
I don't come from KL or JB so I don't know any vet that treats guinea pigs but you can ask these vets wheater they do treat gp's or not. I don't know much about customs but I think you should have no problem bringing them here since gp's are sold everywhere in Malaysia and they do sold out very fast.
Sorry if I can't help much because I am quite new to gp's.