Seager, for quality bettas AB is very good I hear - not used it myself. Yes the trip for them can be stressful and you will have to do just a bit more acclimatisation to ensure transfer survival. But that would be one method to obtain your CT.
Short of this, you will have to source local pet stores. I recommend you ring beforehand, no point in going into the shop to find what they have or don’t have. Ask if they have any CTs - if they do, head in and see what they got. This method may expand your willingness to do a long distance trip to a store should they guarantee a CT being there.
Other than that, you other option is local breeders to you or within your country. BF has classifieds for Bettas up for sale/adoption, but they will be traveling in a similar fashion to anything via AB in Asia.
Hope you find what you are after - just be aware, CTs are finicky with water hardness. Their rays will curl if it is too hard, defeating the whole aesthetic purpose of getting a CT.