My experience, albeit with a Honda motorcycle, is different.
In the UK I own a Thai manufactured Honda motorcycle. Wherever possible I buy parts for it in Thailand as in the UK the parts are four to five times the Thai price. There is, in fact, a grey market for parts for this model. On E bay there are numerous people selling service parts.
Of course with a motorcycle it is much easier to hand carry parts from A to B. I would not consider hand carrying car parts such as a clutch, drive shaft or exhaust system.