Question
how can I get some blueberry seeds sent to me in Thailand

Answer
Hi Bill,
Thanx for your question.  I know of no sellers of blueberry seeds.  It would appear they are only sold as plants.  If you do not have access to blueberries in Thailand, I would see if I could not locate someone who lives in the deep South and ask them to send you seeds from Blueberries growing down there.  It is my understanding that the Deep South varieties don't need the same cold period northern varieties do.  Someone will have to gather the berries for you, remove the seeds, allow the seeds to dry out and then they'll have to see if it is even legal to send the seeds into the country.  I hope this helps.
Tom